bronco/sensor: fix capsensor diff reg error

1.SX937X_DIFF_PHx is 4 bytes interval,not 12 bytes.
  2.sx937x_multi.c

Change-Id: I0bbd538bfed8d951c1d8cb08cab1525a7e305e47
Signed-off-by: weimh1@motorola.com <weimh1@motorola.com>
Reviewed-on: https://gerrit.mot.com/2416957
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Lijun Chen <chenlj2@motorola.com>
Reviewed-by: Hujun Liao <liaohj@motorola.com>
Submit-Approved: Jira Key

drivers/misc/sx937x_multi/sx937x_multi.c

@@ -708,7 +708,7 @@ static ssize_t sx937x_fac_raw_show(struct device *dev,
 
 	LOG_INFO("%s sx937x_fac_raw_show\n", this->hw->dbg_name);
 	for ( i = 0; i < MAX_CHANNEL_NUMBER; i++) {
-		read_ret=sx937x_i2c_read_16bit(this->bus,reg_addr+0xc*i,&temp_val);
+		read_ret=sx937x_i2c_read_16bit(this->bus,reg_addr+0x4*i,&temp_val);
 		if(read_ret<0){
 			LOG_INFO("failed to read reg data 0x%x", reg_addr);
 		}