pinctrl: mediatek: add driver for MT8512

Add Pinctrl driver for MediaTek MT8512 SoC.

diff --git a/drivers/pinctrl/mediatek/Makefile b/drivers/pinctrl/mediatek/Makefile
index 0ab7b15..ba95557 100644
--- a/drivers/pinctrl/mediatek/Makefile
+++ b/drivers/pinctrl/mediatek/Makefile
@@ -5,5 +5,6 @@
 # SoC Drivers
 obj-$(CONFIG_PINCTRL_MT7623) += pinctrl-mt7623.o
 obj-$(CONFIG_PINCTRL_MT7629) += pinctrl-mt7629.o
+obj-$(CONFIG_PINCTRL_MT8512) += pinctrl-mt8512.o
 obj-$(CONFIG_PINCTRL_MT8516) += pinctrl-mt8516.o
 obj-$(CONFIG_PINCTRL_MT8518) += pinctrl-mt8518.o