Update synopsys drivers to not rely on undefined overflow behaviour

This consists of ensuring that the left operand of each shift is
unsigned when the operation might overflow into the sign bit.

Change-Id: I54560fe290e7dc52d364d0fe1c81a16f4c8d9a7b
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>

drivers/synopsys/emmc/dw_mmc.c

@@ -14,6 +14,7 @@
 #include <drivers/delay_timer.h>
 #include <drivers/mmc.h>
 #include <drivers/synopsys/dw_mmc.h>
+#include <lib/utils_def.h>
 #include <lib/mmio.h>
 
 #define DWMMC_CTRL			(0x00)
@@ -55,7 +56,7 @@
 
 #define DWMMC_CMDARG			(0x28)
 #define DWMMC_CMD			(0x2c)
-#define CMD_START			(1 << 31)
+#define CMD_START			(U(1) << 31)
 #define CMD_USE_HOLD_REG		(1 << 29)	/* 0 if SDR50/100 */
 #define CMD_UPDATE_CLK_ONLY		(1 << 21)
 #define CMD_SEND_INIT			(1 << 15)
@@ -100,7 +101,7 @@
 #define IDMAC_DES0_CH			(1 << 4)
 #define IDMAC_DES0_ER			(1 << 5)
 #define IDMAC_DES0_CES			(1 << 30)
-#define IDMAC_DES0_OWN			(1 << 31)
+#define IDMAC_DES0_OWN			(U(1) << 31)
 #define IDMAC_DES1_BS1(x)		((x) & 0x1fff)
 #define IDMAC_DES2_BS2(x)		(((x) & 0x1fff) << 13)