defconfig: arm: msm: Enable CONFIG_ARM_KERNMEM_PERMS for msm8953

Enabling ARM_KERNMEM_PERMS will make kernel
memory other than kernel text as non-executable.
Also this would enable dependent config
CONFIG_DEBUG_RODATA which would help catch
attempts to change the kernel's executable code.

Change-Id: I840729b340a95c1dbae1f9467a450c8ea35a78c3
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>