ASoC: wm8993: Add register default for INPUTS_CLAMP

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8993.c

@@ -61,6 +61,7 @@ static struct reg_default wm8993_reg_defaults[] = {
 	{ 18,  0x0000 },     /* R18  - GPIO CTRL 1 */
 	{ 19,  0x0010 },     /* R19  - GPIO1 */
 	{ 20,  0x0000 },     /* R20  - IRQ_DEBOUNCE */
+	{ 21,  0x0000 },     /* R21  - Inputs Clamp */
 	{ 22,  0x8000 },     /* R22  - GPIOCTRL 2 */
 	{ 23,  0x0800 },     /* R23  - GPIO_POL */
 	{ 24,  0x008B },     /* R24  - Left Line Input 1&2 Volume */