Drop use of CONFIG_SYS_GENERIC_BOARD in U-Boot

This option is always enabled and is about to be removed. Drop references
to it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Andreas Bießmann <andreas@biessmann.org>
diff --git a/include/watchdog.h b/include/watchdog.h
index 9273fa1..174c894 100644
--- a/include/watchdog.h
+++ b/include/watchdog.h
@@ -21,8 +21,7 @@
 int init_func_watchdog_reset(void);
 #endif
 
-#if defined(CONFIG_SYS_GENERIC_BOARD) && \
-	(defined(CONFIG_WATCHDOG) || defined(CONFIG_HW_WATCHDOG))
+#if defined(CONFIG_WATCHDOG) || defined(CONFIG_HW_WATCHDOG)
 #define INIT_FUNC_WATCHDOG_INIT	init_func_watchdog_init,
 #define INIT_FUNC_WATCHDOG_RESET	init_func_watchdog_reset,
 #else