arm: exynos: clean up checkpatch issues

This patch will fix these checkpatch issues.

ERROR: Macros with complex values should be enclosed in parentheses
+#define DEFAULT_DQS_X4		(DEFAULT_DQS << 24) || (DEFAULT_DQS << 16) \
+				|| (DEFAULT_DQS << 8) || (DEFAULT_DQS << 0)

		ERROR: space prohibited before that ',' (ctx:WxW)
+	writel(val , &drex0->concontrol);
 	           ^

ERROR: space prohibited before that ',' (ctx:WxW)
+	writel(val , &drex1->concontrol);
    	           ^

Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>