kernel:add ADC_GPIO3_DIV3 adc channel

add ADC_GPIO3_DIV3 adc channel for read
vbus voltage for nopmi project

Change-Id: Ia4011ea66946fce882f25c469aa276c198462f60
Signed-off-by: wutao <huaqin89@motorola.com>
Reviewed-on: https://gerrit.mot.com/2133308
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Haijian Ma <mahj8@motorola.com>
Reviewed-by: Wei Xu <xuwei9@lenovo.com>
Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com>
Submit-Approved: Jira Key

drivers/iio/adc/qcom-spmi-adc5.c

@@ -931,6 +931,8 @@ static const struct adc_channels adc_chans_pmic5[ADC_MAX_CHANNEL] = {
 					SCALE_HW_CALIB_THERM_100K_PULLUP)
 	[ADC_GPIO4_PU2]	= ADC_CHAN_TEMP("gpio4_pu2", 1,
 					SCALE_HW_CALIB_THERM_100K_PULLUP)
+	[ADC_GPIO3_DIV3]		= ADC_CHAN_VOLT("gpio3_div3", 1,
+					SCALE_HW_CALIB_DEFAULT)
 };
 
 static const struct adc_channels adc7_chans_pmic[ADC_MAX_CHANNEL] = {