msm:board-msm7x27a: Increase pmem for camera memory constraints

Increasing PMEM temporarily to allocate jpeg heap on pmem.
Once ASHMEM is working properly, this PMEM increase will be reverted.

Change-Id: Ia5b77c7222ac298b61f51f3c11965f3dfe938304
Signed-off-by: Roja Rani Yarubandi <rojay@codeaurora.org>