drivers: pinctrl: tegra: incorporate existing code

Move all existing pinmux and funcmux code into a dedicated folder in
pinctrl to simplify further maintenance.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
diff --git a/arch/arm/mach-tegra/tegra30/Makefile b/arch/arm/mach-tegra/tegra30/Makefile
index 28dd486..ee0e6f5 100644
--- a/arch/arm/mach-tegra/tegra30/Makefile
+++ b/arch/arm/mach-tegra/tegra30/Makefile
@@ -5,4 +5,4 @@
 obj-$(CONFIG_SPL_BUILD) += cpu.o
 obj-$(CONFIG_$(SPL_)CMD_EBTUPDATE) += bct.o
 
-obj-y	+= clock.o funcmux.o pinmux.o
+obj-y	+= clock.o