dm: mips: Fix warnings in lb60 board

The lb60 board accesses the clkgr register, which is 32bit via
16bit IO ops. This causes malfunction. Fix this.

qi_lb60.c: In function ‘cpm_init’:
qi_lb60.c:72:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
qi_lb60.c:84:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Daniel <zpxu@ingenic.cn>
Cc: Shinya Kuribayashi <skuribay@pobox.com>
Cc: Xiangfu Liu <xiangfu@openmobilefree.net>

board/qi/qi_lb60/qi_lb60.c

@@ -69,7 +69,7 @@ static void gpio_init(void)
 static void cpm_init(void)
 {
 	struct jz4740_cpm *cpm = (struct jz4740_cpm *)JZ4740_CPM_BASE;
-	uint32_t reg = readw(&cpm->clkgr);
+	uint32_t reg = readl(&cpm->clkgr);
 
 	reg |=	CPM_CLKGR_IPU |
 		CPM_CLKGR_CIM |
@@ -81,7 +81,7 @@ static void cpm_init(void)
 		CPM_CLKGR_UDC |
 		CPM_CLKGR_AIC1;
 
-	writew(reg, &cpm->clkgr);
+	writel(reg, &cpm->clkgr);
 }
 
 int board_early_init_f(void)