soc: qcom: Add check to handle out of bound access

Adding check in msm_minidump_add_region() to handle scenarios for
out of bound access while adding region in minidump table in SMEM.

Change-Id: Ic20663dbd2fa8ae96899930a7f7ba79dc204ff5e
Signed-off-by: Komal Bajaj <kbajaj@codeaurora.org>
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>