board: ge: common: rename ge_common.c to ge_rtc.c

The file only contains RTC related code, so let's name
it accordingly.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
diff --git a/board/ge/mx53ppd/mx53ppd.c b/board/ge/mx53ppd/mx53ppd.c
index 7627e9c..2e9d389 100644
--- a/board/ge/mx53ppd/mx53ppd.c
+++ b/board/ge/mx53ppd/mx53ppd.c
@@ -36,7 +36,7 @@
 #include <watchdog.h>
 #include "ppd_gpio.h"
 #include <stdlib.h>
-#include "../../ge/common/ge_common.h"
+#include "../../ge/common/ge_rtc.h"
 #include "../../ge/common/vpd_reader.h"
 
 DECLARE_GLOBAL_DATA_PTR;