pinctrl: sunxi: Declare the number of interrupt banks in the descriptor

Declare in the description structure associated to the compatible the number of
interrupt banks the device has. For now, we're not doing anything with it.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/sunxi/pinctrl-sun6i-a31-r.c b/drivers/pinctrl/sunxi/pinctrl-sun6i-a31-r.c
index 8fcba48..9a2517b 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sun6i-a31-r.c
+++ b/drivers/pinctrl/sunxi/pinctrl-sun6i-a31-r.c
@@ -93,6 +93,7 @@
 	.pins = sun6i_a31_r_pins,
 	.npins = ARRAY_SIZE(sun6i_a31_r_pins),
 	.pin_base = PL_BASE,
+	.irq_banks = 2,
 };
 
 static int sun6i_a31_r_pinctrl_probe(struct platform_device *pdev)