mpc85xx: generic: Check kernel size for the TL-WDR4900
TP-Link TL-WDR 4900 have u-boot with read-only env.
Boot command read only 0x29F000 data from flash.
Bigger images causes crc error. It can't be changed.
This patch add kernel size checking.
Signed-off-by: Pawel Dembicki <[email protected]>
Signed-off-by: Christian Lamparter <[email protected]> [utilize KERNEL_SIZE]