spl: Drop #ifdefs for BOARD_INIT and watchdog

Avoid using the preprocessor for these checks.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/spl/spl.c b/common/spl/spl.c
index d930d20..530ade5 100644
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -778,13 +778,11 @@
 		}
 	}
 
-#if CONFIG_IS_ENABLED(BOARD_INIT)
-	spl_board_init();
-#endif
+	if (CONFIG_IS_ENABLED(BOARD_INIT))
+		spl_board_init();
 
-#if defined(CONFIG_SPL_WATCHDOG) && CONFIG_IS_ENABLED(WDT)
-	initr_watchdog();
-#endif
+	if (IS_ENABLED(CONFIG_SPL_WATCHDOG) && CONFIG_IS_ENABLED(WDT))
+		initr_watchdog();
 
 	if (IS_ENABLED(CONFIG_SPL_OS_BOOT) || CONFIG_IS_ENABLED(HANDOFF) ||
 	    IS_ENABLED(CONFIG_SPL_ATF))