pinctrl: gemini: Fix missing pad descriptions

A pretty clever static checker found a bug in my patch: I added more
bits to a bitmask but didn't extend the array indexed to the same
bitmask.

Fixes: 756a024f3983 ("pinctrl: gemini: Fix GMAC groups")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-gemini.c

@@ -136,6 +136,8 @@ static const char * const gemini_padgroups[] = {
 	"PCI CLK",
 	NULL, NULL,
 	"TVC CLK",
+	NULL, NULL, NULL, NULL, NULL,
+	"GMAC1",
 };
 
 static const struct pinctrl_pin_desc gemini_3512_pins[] = {