powerpc/mpc85xx: socrates: add initrd_high default environment variable

we need to set initrd_high to get fitimage booting.

Without, U-Boot drops when booting fitimage:

ERROR: Failed to allocate 0x59a0b6 bytes below 0x800000.
ramdisk - allocation error
bootm - boot application image from memory

Signed-off-by: Heiko Schocher <hs@denx.de>
1 file changed