global: Migrate CONFIG_FTRTC010_EXTCLK to CFG

Perform a simple rename of CONFIG_FTRTC010_EXTCLK to CFG_FTRTC010_EXTCLK

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/rtc/ftrtc010.c b/drivers/rtc/ftrtc010.c
index 67c2b6e..768c8cd 100644
--- a/drivers/rtc/ftrtc010.c
+++ b/drivers/rtc/ftrtc010.c
@@ -82,7 +82,7 @@
 
 #ifdef CONFIG_FTRTC010_PCLK
 	now = (ftrtc010_time() + readl(&rtc->record)) / RTC_DIV_COUNT;
-#else /* CONFIG_FTRTC010_EXTCLK */
+#else /* CFG_FTRTC010_EXTCLK */
 	now = ftrtc010_time() + readl(&rtc->record);
 #endif