sync arch/arm from zte v889d stock kernel

Change-Id: I110a32f23ca0085d92b8c66dce72211206362077
Add ability to use variant defconfig for device differences and use shared defconfig
add zte_n880e_variant_defconfig

Change-Id: I56102e5817b06e9ff09a73ab99454fd4c8249b77
Merge branch 'cm-11.0' of https://github.com/KonstaT/android_kernel_zte_msm7x27a into cm-11.0_test

Change-Id: I52329783eafcfcfd24e9e4831c99acd019189e57