diag: Update mask pointers after reallocation

Currently, mask pointers are not updated in
case peripherals are supporting more mask
tables. The patch updates the mask pointers
properly.

Change-Id: I1360c722076fca0215e0ccd28247c4741a1ebd88
Signed-off-by: Mohit Aggarwal <maggarwa@codeaurora.org>
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>