mmc: sdhci-of-dwcmshc: Change DLL_STRBIN_TAPNUM_DEFAULT to 0x4

strbin signal delay under 0x8 configuration is not stable after massive
test. The recommandation of it should be 0x4.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Tested-by: Alexey Charkov <alchark@gmail.com>
Tested-by: Hugh Cole-Baker <sigmaris@gmail.com>
Fixes: 08f3dff ("mmc: sdhci-of-dwcmshc: add rockchip platform support")
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: shawn1221

drivers/mmc/host/sdhci-of-dwcmshc.c

@@ -94,7 +94,7 @@
 #define DLL_TXCLK_TAPNUM_DEFAULT	0x10
 #define DLL_TXCLK_TAPNUM_90_DEGREES	0xA
 #define DLL_TXCLK_TAPNUM_FROM_SW	BIT(24)
-#define DLL_STRBIN_TAPNUM_DEFAULT	0x8
+#define DLL_STRBIN_TAPNUM_DEFAULT	0x4
 #define DLL_STRBIN_TAPNUM_FROM_SW	BIT(24)
 #define DLL_STRBIN_DELAY_NUM_SEL	BIT(26)
 #define DLL_STRBIN_DELAY_NUM_OFFSET	16