configs/socrates_cyclone5: remove defconfig, broken

This defconfig no longer builds:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/11026772887

It has been broken for at least 2 months:

  https://gitlab.com/buildroot.org/buildroot/-/jobs?name=T%3Dsocrates_cyclone5&kind=BUILD

It uses the outdated and not even LTS 4.16.7 Linux kernel, which no
longer builds with modern toolchains.

Unless a fix is provided, this defconfig will be removed.

Fixes:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/11026772887

Cc: Michał Łyszczek <michal.lyszczek@bofc.pl>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Arnout Vandecappelle <arnout@rnout.be>

board/altera/socrates_cyclone5/boot-env.txt

@@ -1,8 +0,0 @@
-linux_load_address=0x100000
-linux_dtb_load_address=0x100
-linux_dtb=socfpga_cyclone5_socrates.dtb
-linux_load=mmc rescan; fatload mmc 0:1 ${linux_load_address} zImage; fatload mmc 0:1 ${linux_dtb_load_address} ${linux_dtb}
-bootargs=console=ttyS0,115200 root=/dev/mmcblk0p3 ro rootwait
-source_env=fatload mmc 0:1 0x2000000 boot.scr; source 0x2000000
-bootcmd=run linux_load; bootz ${linux_load_address} - ${linux_dtb_load_address}
-bootdelay=1

board/altera/socrates_cyclone5/genimage.cfg

@@ -1,59 +0,0 @@
-image boot.vfat {
-	vfat {
-		files = {
-			"zImage",
-			"socfpga_cyclone5_socrates.dtb"
-		}
-	}
-
-	size = 8M
-}
-
-image uboot.img {
-	hdimage {
-		partition-table = "no"
-	}
-
-	partition spl {
-		in-partition-table = "no"
-		image = "u-boot-spl.bin.crc"
-		offset = 0
-		size = 64K
-	}
-
-	partition uboot-full {
-		in-partition-table = "no"
-		image = "u-boot.img"
-		offset = 256K
-	}
-
-	size = 1M
-}
-
-image sdcard.img {
-	hdimage {
-	}
-
-	partition uboot-env {
-		in-partition-table = "no"
-		image = "uboot-env.bin"
-		offset = 17K # 512 * 34 -> just after gpt
-	}
-
-	partition boot {
-		partition-type = 0xc
-		bootable = "true"
-		image = "boot.vfat"
-	}
-
-	partition uboot {
-		partition-type = 0xa2
-		image = "uboot.img"
-	}
-
-	partition rootfs {
-		partition-type = 0x83
-		image = "rootfs.ext2"
-		size = 500M
-	}
-}

board/altera/socrates_cyclone5/readme.txt

@@ -1,52 +0,0 @@
-EBV SoCrates Evaluation Board
-
-Intro
-=====
-
-More information about this board can be found here:
-https://rocketboards.org/foswiki/Documentation/EBVSoCratesEvaluationBoard
-
-Build
-=====
-
-First, load socrates config for buildroot
-
-    make socrates_cyclone5_defconfig
-
-Build everything
-
-    make
-
-Following files will be generated in output/images
-
-.
-├── boot.vfat
-├── rootfs.ext2
-├── rootfs.ext4 -> rootfs.ext2
-├── rootfs.tar
-├── sdcard.img
-├── socfpga_cyclone5_socrates.dtb
-├── u-boot-spl.bin
-├── u-boot-spl.bin.crc
-├── u-boot.bin
-├── u-boot.img
-├── uboot-env.bin
-├── uboot.img
-└── zImage
-
-
-Creating bootable SD card
-=========================
-
-Simply invoke
-
-dd if=output/images/sdcard.img of=/dev/sdX
-
-Where X is your SD card device (not partition)
-
-Booting
-=======
-
-Pins 6:8 on P18 selector is used to determine boot device. To boot socrates from
-sdcard set these pins to value 0x5 (101b). Remaining pins are used to determine
-how to configure FPGA and are not associated with booting into Linux kernel.