soc/mediatek: remove unused RTC_GPIO_USER_MASK

RTC_GPIO_USER_MASK is not used in any drivers, so we remove them.

BUG=none
TEST=build pass

Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: I0a15d5da142bb38feb595610d69566330e31fedd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62457
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/soc/mediatek/common/rtc_mt6359p.c

@@ -9,8 +9,6 @@
 #include <soc/rtc_common.h>
 #include <timer.h>
 
-#define RTC_GPIO_USER_MASK	  ((1 << 13) - (1 << 8))
-
 static struct pmif *pmif_arb = NULL;
 
 void rtc_read(u16 addr, u16 *rdata)

src/soc/mediatek/mt8173/rtc.c

@@ -7,8 +7,6 @@
 #include <soc/pmic_wrap.h>
 #include <types.h>
 
-#define RTC_GPIO_USER_MASK	  ((1 << 13) - (1 << 8))
-
 /* initialize rtc related gpio */
 static bool rtc_gpio_init(void)
 {

src/soc/mediatek/mt8183/rtc.c

@@ -8,8 +8,6 @@
 #include <soc/pmic_wrap.h>
 #include <timer.h>
 
-#define RTC_GPIO_USER_MASK	  ((1 << 13) - (1 << 8))
-
 /* initialize rtc setting of using dcxo clock */
 static bool rtc_enable_dcxo(void)
 {

src/soc/mediatek/mt8186/rtc.c

@@ -13,8 +13,6 @@
 #include <soc/pmic_wrap.h>
 #include <timer.h>
 
-#define RTC_GPIO_USER_MASK	  ((1 << 13) - (1 << 8))
-
 /* Initialize RTC setting of using DCXO clock */
 static bool rtc_enable_dcxo(void)
 {