uboot-imx

MA-16668-2 Fix kernel hang after enabling debug configs

The Kernel image will get bigger with some debug configs,
48MB memory is not enough to hold the kernel image and its
.bss segment now.

For imx8m, we will reserve 64MB for kernel, 2MB for fdt and
16MB for ramdisk. For imx8q, we will reserve 60MB for kernel,
1.5MB for fdt and 16MB for ramdisk.

Test: boots with 'kasan' enabled.

Change-Id: I79d8e76c89f4add51bea1a16486c94c0b9f017db
Signed-off-by: Ji Luo <ji.luo@nxp.com>