spl: ti: Avoid preloader_console_init if !CONFIG_SPL_SERIAL_SUPPORT

If CONFIG_SPL_SERIAL_SUPPORT is disabled then the build fails because
serial_init is undefined. Guard preloader_console_init() appropriately
to fix this.
Signed-off-by: NAlex Kiernan <alex.kiernan@gmail.com>

arch/arm/mach-omap2/boot-common.c

@@ -196,9 +196,10 @@ u32 spl_boot_mode(const u32 boot_device)
 
 void spl_board_init(void)
 {
+#ifdef CONFIG_SPL_SERIAL_SUPPORT
 	/* Prepare console output */
 	preloader_console_init();
-
+#endif
 #if defined(CONFIG_SPL_NAND_SUPPORT) || defined(CONFIG_SPL_ONENAND_SUPPORT)
 	gpmc_init();
 #endif

common/spl/spl.c

@@ -471,6 +471,7 @@ void board_init_r(gd_t *dummy1, ulong dummy2)
 	jump_to_image_no_args(&spl_image);
 }
 
+#ifdef CONFIG_SPL_SERIAL_SUPPORT
 /*
  * This requires UART clocks to be enabled.  In order for this to work the
  * caller must ensure that the gd pointer is valid.
@@ -491,6 +492,7 @@ void preloader_console_init(void)
 	spl_display_print();
 #endif
 }
+#endif
 
 /**
  * spl_relocate_stack_gd() - Relocate stack ready for board_init_r() execution