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/board.c b/arch/arm/mach-tegra/board.c
index f8b61a2..9224743 100644
--- a/arch/arm/mach-tegra/board.c
+++ b/arch/arm/mach-tegra/board.c
@@ -17,7 +17,7 @@
 #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>
 #endif
 #if IS_ENABLED(CONFIG_TEGRA_MC)
@@ -163,7 +163,7 @@
 	return 0;
 }
 
-#if IS_ENABLED(CONFIG_TEGRA_PINCTRL)
+#if CONFIG_IS_ENABLED(PINCTRL_TEGRA)
 static int uart_configs[] = {
 #if defined(CONFIG_TEGRA20)
  #if defined(CONFIG_TEGRA_UARTA_UAA_UAB)
@@ -235,7 +235,7 @@
 
 void board_init_uart_f(void)
 {
-#if IS_ENABLED(CONFIG_TEGRA_PINCTRL)
+#if CONFIG_IS_ENABLED(PINCTRL_TEGRA)
 	int uart_ids = 0;	/* bit mask of which UART ids to enable */
 
 #ifdef CONFIG_TEGRA_ENABLE_UARTA