rtc: mxc_v2: Fix _iomem pointer notation

Fix the iomem pointer notation in order to fix the following sparse
warnings:

drivers/rtc/rtc-mxc_v2.c:280:18: warning: incorrect type in argument 1 (different address spaces)
drivers/rtc/rtc-mxc_v2.c:280:18:    expected void const volatile [noderef] <asn:2>*addr
drivers/rtc/rtc-mxc_v2.c:280:18:    got void *[noderef] <asn:2>ioaddr
drivers/rtc/rtc-mxc_v2.c:329:44: warning: incorrect type in argument 1 (different address spaces)
drivers/rtc/rtc-mxc_v2.c:329:44:    expected void *[noderef] <asn:2>ioaddr
drivers/rtc/rtc-mxc_v2.c:329:44:    got void [noderef] <asn:2>*
drivers/rtc/rtc-mxc_v2.c:339:44: warning: incorrect type in argument 1 (different address spaces)
drivers/rtc/rtc-mxc_v2.c:339:44:    expected void *[noderef] <asn:2>ioaddr
drivers/rtc/rtc-mxc_v2.c:339:44:    got void [noderef] <asn:2>*

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-mxc_v2.c

@@ -273,7 +273,7 @@ static const struct rtc_class_ops mxc_rtc_ops = {
 	.alarm_irq_enable = mxc_rtc_alarm_irq_enable,
 };
 
-static int mxc_rtc_wait_for_flag(void *__iomem ioaddr, int flag)
+static int mxc_rtc_wait_for_flag(void __iomem *ioaddr, int flag)
 {
 	unsigned int timeout = REG_READ_TIMEOUT;