power: pmic: add the base MAX8907 PMIC support

Add basic i2c based read/write functions to access PMIC registers.

Tested-by: Ion Agorria <ion@agorria.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
diff --git a/drivers/power/pmic/Kconfig b/drivers/power/pmic/Kconfig
index 5a61cd4..ec7ccc3 100644
--- a/drivers/power/pmic/Kconfig
+++ b/drivers/power/pmic/Kconfig
@@ -184,6 +184,15 @@
 	This config enables implementation of driver-model pmic uclass features
 	for PMIC PFUZE100 in SPL. The driver implements read/write operations.
 
+config DM_PMIC_MAX8907
+	bool "Enable Driver Model for PMIC MAX8907"
+	---help---
+	This config enables implementation of driver-model pmic uclass features
+	for PMIC MAX8907. The driver implements read/write operations.
+	This is a Power Management IC with a decent set of peripherals from which
+	3 DC-to-DC Step-Down (SD) Regulators, 20 Low-Dropout Linear (LDO) Regulators,
+	Real-Time Clock (RTC) and more with I2C Compatible Interface.
+
 config DM_PMIC_MAX77663
 	bool "Enable Driver Model for PMIC MAX77663"
 	---help---