ARCH: arm: pmipv6 kernel changes

This change add defconfig needed to support pmipv6

Change-Id: I39d03a32144253ad7077b5fb85b3c01bdc030543
Acked-by: Suraj Jaiswal <c_surajj@qti.qualcomm.com>
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>