Revert "Input: matrix_keypad - force switch rows to input mode"

This reverts commit 01c84b03d80aab9f04c4e3e1f9085f4202ff7c29.

The commit makes every scan call gpiod_direction_input() on the row
GPIOs. On pin controllers where GPIO input and interrupt are separate
pinmux functions this switches the row pins out of interrupt mode, and
enable_row_irqs() does not switch them back: it only unmasks the
interrupts. Row interrupts then never arrive and the keypad stops
working. Seen with a matrix keypad on an Allwinner A64 board (PINE
A64-LTS); it works again with the commit reverted.

The workaround is not needed on Ingenic either: the author of the
reverted commit re-tested all available JZ47xx SoCs and they all report
the live pin state in interrupt mode, see the thread in Link.

Fixes: 01c84b03d80a ("Input: matrix_keypad - force switch rows to input mode")
Link: https://lore.kernel.org/all/4130C026-2A83-408B-836A-ECA044491C47@gmail.com/
Cc: stable@vger.kernel.org
Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
Acked-by: Siarhei Volkau <lis8215@gmail.com>
Acked-by: Paul Cercueil <paul@crapouillou.net>
Link: https://patch.msgid.link/20261002100935.449473-1-al.kochet@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>