powerpc/85xx: Bump up the CONFIG_SYS_BOOTM_LEN to 16M on FSL 85xx boards

CONFIG_SYS_BOOTMAPSZ has been 16M on these boards for some time so we
should also allow the kernel image to be up to 16M decompressed.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
14 files changed