msm: camera: util: validate patch offset value

While processing the packet patches, validate the destination
and source offset value against the destination buffer length
and source buffer length. If offset value is greater than
buffer length return error.

Change-Id: I4a82630558ff4ba0a28891ccec0497346ee904d1
Signed-off-by: Ravikishore Pampana <rpampana@codeaurora.org>