spl: Always define preloader_console_init

A large number of boards call preloader_console_init unconditionally.
Currently, they fail to build with CONFIG_SPL_SERIAL=n, because the
function is undefined in that case. To fix the build, always define
preloader_console_init, but make it no-op when CONFIG_SPL_SERIAL=n.

For the few boards that did check for CONFIG_SPL_SERIAL before calling
preloader_console_init, remove the checks, since the function can now
be called unconditionally.
Signed-off-by: NSamuel Holland <samuel@sholland.org>
Reviewed-by: NStefan Roese <sr@denx.de>
Reviewed-by: NLokesh Vutla <lokeshvutla@ti.com>

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

@@ -194,10 +194,9 @@ u32 spl_mmc_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

arch/arm/mach-uniphier/spl_board_init.c

@@ -112,9 +112,7 @@ void spl_board_init(void)
 
 	initdata->early_clk_init();
 
-#ifdef CONFIG_SPL_SERIAL_SUPPORT
 	preloader_console_init();
-#endif
 
 	ret = initdata->dpll_init(bd);
 	if (ret) {

common/spl/spl.c

@@ -574,8 +574,7 @@ void board_init_f(ulong dummy)
 		}
 	}
 
-	if (CONFIG_IS_ENABLED(SERIAL_SUPPORT))
-		preloader_console_init();
+	preloader_console_init();
 }
 #endif
 
@@ -724,13 +723,13 @@ 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.
  */
 void preloader_console_init(void)
 {
+#ifdef CONFIG_SPL_SERIAL_SUPPORT
 	gd->baudrate = CONFIG_BAUDRATE;
 
 	serial_init();		/* serial communications setup */
@@ -744,8 +743,8 @@ void preloader_console_init(void)
 #ifdef CONFIG_SPL_DISPLAY_PRINT
 	spl_display_print();
 #endif
-}
 #endif
+}
 
 /**
  * This function is called before the stack is changed from initial stack to