Update the zynqmp readme.txt file to use BR2_TARGET_UBOOT_ZYNQMP_PSU_INIT_FILE
option for configuring custom zynqmp boards with Buildroot. There is no need
for any custom / manual steps since the support is included with Buildroot.
Signed-off-by: Neal Frager <neal.frager@amd.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>
c52d711923