rtc: ds1337: drop "SYS" from config variables

There is some inconsistency between uses of CONFIG_RTC_DS13xx and
CONFIG_SYS_RTC_DS13xx. Address this by dropping the "SYS" from
these variables.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/rtc/ds1337.c b/drivers/rtc/ds1337.c
index dae1b3c..4b73d17 100644
--- a/drivers/rtc/ds1337.c
+++ b/drivers/rtc/ds1337.c
@@ -150,11 +150,11 @@
  * SQW/INTB* pin and program it for 32,768 Hz output. Note that
  * according to the datasheet, turning on the square wave output
  * increases the current drain on the backup battery from about
- * 600 nA to 2uA. Define CONFIG_SYS_RTC_DS1337_NOOSC if you wish to turn
+ * 600 nA to 2uA. Define CONFIG_RTC_DS1337_NOOSC if you wish to turn
  * off the OSC output.
  */
 
-#ifdef CONFIG_SYS_RTC_DS1337_NOOSC
+#ifdef CONFIG_RTC_DS1337_NOOSC
  #define RTC_DS1337_RESET_VAL \
 	(RTC_CTL_BIT_INTCN | RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2)
 #else
@@ -162,16 +162,16 @@
 #endif
 void rtc_reset (void)
 {
-#ifdef CONFIG_SYS_RTC_DS1337
+#ifdef CONFIG_RTC_DS1337
 	rtc_write (RTC_CTL_REG_ADDR, RTC_DS1337_RESET_VAL);
-#elif defined CONFIG_SYS_RTC_DS1388
+#elif defined CONFIG_RTC_DS1388
 	rtc_write(RTC_CTL_REG_ADDR, 0x0); /* hw default */
 #endif
-#ifdef CONFIG_SYS_DS1339_TCR_VAL
-	rtc_write (RTC_TC_REG_ADDR, CONFIG_SYS_DS1339_TCR_VAL);
+#ifdef CONFIG_RTC_DS1339_TCR_VAL
+	rtc_write (RTC_TC_REG_ADDR, CONFIG_RTC_DS1339_TCR_VAL);
 #endif
-#ifdef CONFIG_SYS_DS1388_TCR_VAL
-	rtc_write(RTC_TC_REG_ADDR, CONFIG_SYS_DS1388_TCR_VAL);
+#ifdef CONFIG_RTC_DS1388_TCR_VAL
+	rtc_write(RTC_TC_REG_ADDR, CONFIG_RTC_DS1388_TCR_VAL);
 #endif
 }