gpio: pca953x: use pca953x_read_regs instead of regmap_bulk_read

The register number needs to be translated for chips with more than 8
ports. This patch fixes a bug causing all chips with more than 8 GPIO pins
to not work correctly.

Fixes: 0f25fda8

 ("gpio: pca953x: Zap ad-hoc reg_direction cache")
Cc: Cc: <stable@vger.kernel.org>
Signed-off-by: David Jander <david@protonic.nl>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>