ARM: tegra: Use standard cache enable for 64-bit

On 64-bit SoCs the I-cache isn't enabled in early code, so the default
cache enable functions for 64-bit ARM can be used.
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NTom Warren <twarren@nvidia.com>
Signed-off-by: NStephen Warren <swarren@nvidia.com>

arch/arm/mach-tegra/board.c

@@ -198,7 +198,7 @@ void board_init_uart_f(void)
 	setup_uarts(uart_ids);
 }
 
-#ifndef CONFIG_SYS_DCACHE_OFF
+#if !defined(CONFIG_SYS_DCACHE_OFF) && !defined(CONFIG_ARM64)
 void enable_caches(void)
 {
 	/* Enable D-cache. I-cache is already enabled in start.S */