sh: sh7786: Fix last GPIO index

A careless look at the code shows that the last entry in the
pinmux_gpios seems to be GPIO_FN_FSE. However, entries are ordered by
the GPIO number, as the PINMUX_GPIO macro is expended to an indexed
array initializer. The last entry in the array is thus GPIO_FN_IRL4. Set
the pinmux_info last_gpio field accordingly.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/sh/kernel/cpu/sh4a/pinmux-sh7786.c

@@ -825,7 +825,7 @@ static struct pinmux_info sh7786_pinmux_info = {
 	.function = { PINMUX_FUNCTION_BEGIN, PINMUX_FUNCTION_END },
 
 	.first_gpio = GPIO_PA7,
-	.last_gpio = GPIO_FN_FSE,
+	.last_gpio = GPIO_FN_IRL4,
 
 	.gpios = pinmux_gpios,
 	.cfg_regs = pinmux_config_regs,