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/board2.c b/arch/arm/mach-tegra/board2.c
index 8ad76d5..adea12c 100644
--- a/arch/arm/mach-tegra/board2.c
+++ b/arch/arm/mach-tegra/board2.c
@@ -34,7 +34,7 @@
 #if IS_ENABLED(CONFIG_TEGRA_CLKRST)
 #include <asm/arch/clock.h>
 #endif
-#if IS_ENABLED(CONFIG_TEGRA_PINCTRL)
+#if CONFIG_IS_ENABLED(PINCTRL_TEGRA)
 #include <asm/arch/funcmux.h>
 #include <asm/arch/pinmux.h>
 #endif