pmic: Convert pm8916 driver to a generic Qcom PMIC driver

Since both pm8916.c and pm8916_gpio.c are already supporting multiple
Qcom SoCs, it makes sense to rename these drivers to pmic_qcom.c and
qcom_pmic_gpio.c respectively. Also, these driver can be extended to
support additional functionality if required for other Qcom SoCs.

Along with this import latest DT binding: qcom,spmi-pmic.txt from Linux
kernel and thereby remove pm8916.txt.

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
diff --git a/configs/sandbox_spl_defconfig b/configs/sandbox_spl_defconfig
index 76e8acd..11b9aa8 100644
--- a/configs/sandbox_spl_defconfig
+++ b/configs/sandbox_spl_defconfig
@@ -127,7 +127,7 @@
 CONFIG_DM_DEMO_SHAPE=y
 CONFIG_SPL_FIRMWARE=y
 CONFIG_GPIO_HOG=y
-CONFIG_PM8916_GPIO=y
+CONFIG_QCOM_PMIC_GPIO=y
 CONFIG_SANDBOX_GPIO=y
 CONFIG_I2C_CROS_EC_TUNNEL=y
 CONFIG_I2C_CROS_EC_LDO=y
@@ -179,7 +179,7 @@
 CONFIG_DM_PMIC_PFUZE100=y
 CONFIG_DM_PMIC_MAX77686=y
 CONFIG_DM_PMIC_MC34708=y
-CONFIG_PMIC_PM8916=y
+CONFIG_PMIC_QCOM=y
 CONFIG_PMIC_RK8XX=y
 CONFIG_PMIC_S2MPS11=y
 CONFIG_DM_PMIC_SANDBOX=y