Renamed mx28_register to mx28_register_32 to prepare for mx28_register_8

This patch renames mx28_register to mx28_register_32 in order to
prepare for the introduction of an 8-bit register, mx28_register_8.

Signed-off-by: Robert Delien <robert@delien.nl>
Acked-by: Marek Vasut <marex@denx.de>
Tested-by: Marek Vasut <marex@denx.de>
diff --git a/drivers/usb/host/ehci-mxs.c b/drivers/usb/host/ehci-mxs.c
index c795f23..e1bd37e 100644
--- a/drivers/usb/host/ehci-mxs.c
+++ b/drivers/usb/host/ehci-mxs.c
@@ -75,8 +75,8 @@
 
 	int ret;
 	uint32_t usb_base, cap_base;
-	struct mx28_register *digctl_ctrl =
-		(struct mx28_register *)HW_DIGCTL_CTRL;
+	struct mx28_register_32 *digctl_ctrl =
+		(struct mx28_register_32 *)HW_DIGCTL_CTRL;
 	struct mx28_clkctrl_regs *clkctrl_regs =
 		(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
 
@@ -119,8 +119,8 @@
 {
 	int ret;
 	uint32_t tmp;
-	struct mx28_register *digctl_ctrl =
-		(struct mx28_register *)HW_DIGCTL_CTRL;
+	struct mx28_register_32 *digctl_ctrl =
+		(struct mx28_register_32 *)HW_DIGCTL_CTRL;
 	struct mx28_clkctrl_regs *clkctrl_regs =
 		(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;