matrix_keypad: Increase the max limit of rows and columns

Some keyboard controller have support for more than
16 columns and rows.

Change-Id: I3fd207bfcb21648e1e6601c20588907a6c45270e
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>
(cherry picked from commit 1fcc71dd2431913af3a5baab5d2e25ffc318a5ad)

Conflicts:

	include/linux/input/matrix_keypad.h