tegra: remove support for UART SPI switch

This feature was only used for tegra20 seaboard that had a pinmux
conflict on the SPI pins.  These boards were never manufactured, so
remove this support to clean up SPI driver.

Signed-off-by: Allen Martin <amartin@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
diff --git a/arch/arm/include/asm/arch-tegra/board.h b/arch/arm/include/asm/arch-tegra/board.h
index 3db0d93..1a66990 100644
--- a/arch/arm/include/asm/arch-tegra/board.h
+++ b/arch/arm/include/asm/arch-tegra/board.h
@@ -25,8 +25,7 @@
 #define _TEGRA_BOARD_H_
 
 /* Set up pinmux to make UART usable */
-void gpio_config_uart(void);      /* CONFIG_SPI_UART_SWITCH */
-void gpio_early_init_uart(void);  /*!CONFIG_SPI_UART_SWITCH */
+void gpio_early_init_uart(void);
 
 /* Set up early UART output */
 void board_init_uart_f(void);