power: Tidy up #undef of CONFIG_DM_PMIC

Add a proper Kconfig option for SPL so we can remove the hack in some of
the board config files.

This involves adding CONFIG_SPL_DM_PMIC to some of the configs as well
as updateing the Makefile rule for PMIC_RK8XX to exclude SPL.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
[trini: Add SPL_PMIC_RK8XX, enable when needed, handle undef of
        CONFIG_DM_PMIC_PFUZE100 as well]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/power/pmic/Kconfig b/drivers/power/pmic/Kconfig
index fd6648b..cf2a9b2 100644
--- a/drivers/power/pmic/Kconfig
+++ b/drivers/power/pmic/Kconfig
@@ -10,6 +10,19 @@
 	- 'drivers/power/pmic/pmic-uclass.c'
 	- 'include/power/pmic.h'
 
+config SPL_DM_PMIC
+	bool "Enable Driver Model for PMIC drivers (UCLASS_PMIC) in SPL"
+	depends on SPL_DM
+	default y if DM_PMIC
+	---help---
+	This config enables the driver-model PMIC support in SPL.
+	UCLASS_PMIC - designed to provide an I/O interface for PMIC devices.
+	For the multi-function PMIC devices, this can be used as parent I/O
+	device for each IC's interface. Then, each children uses its parent
+	for read/write. For detailed description, please refer to the files:
+	- 'drivers/power/pmic/pmic-uclass.c'
+	- 'include/power/pmic.h'
+
 config PMIC_CHILDREN
 	bool "Allow child devices for PMICs"
 	depends on DM_PMIC
@@ -205,6 +218,15 @@
 	accessed via an I2C interface. The device is used with Rockchip SoCs.
 	This driver implements register read/write operations.
 
+config SPL_PMIC_RK8XX
+	bool "Enable support for Rockchip PMIC RK8XX"
+	depends on DM_PMIC
+	---help---
+	The Rockchip RK808 PMIC provides four buck DC-DC convertors, 8 LDOs,
+	an RTC and two low Rds (resistance (drain to source)) switches. It is
+	accessed via an I2C interface. The device is used with Rockchip SoCs.
+	This driver implements register read/write operations.
+
 config PMIC_S2MPS11
 	bool "Enable Driver Model for PMIC Samsung S2MPS11"
 	depends on DM_PMIC