gpio: pca953x driver handles pca9554 too

Teach drivers/gpio/pca953x.c about PCA9554, another compatible chip.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/gpio/pca953x.c

@@ -30,6 +30,7 @@ static const struct i2c_device_id pca953x_id[] = {
 	{ "pca9537", 4, },
 	{ "pca9538", 8, },
 	{ "pca9539", 16, },
+	{ "pca9554", 8, },
 	{ "pca9555", 16, },
 	{ "pca9557", 8, },
 	/* REVISIT several pca955x parts should work here too */