The ramdisk needs to be loaded after address 0x82000000 otherwise it
fails to boot (as tested with Linux v4.14).  To solve this issue with
FIT image where the ramdisk is placed right after the kernel image,
load the whole FIT image at this address.  Also increase the kernel
size to allow bigger kernels and ramdisks.

Change-Id: I32edbc280906c0bbac4dd23c0a317880cde80fc7
Signed-off-by: Guillaume Tucker <guillaume.tucker@gmail.com>