rockchip: Add option to prevent booting on power plug-in

For Rockchip boards with the all rk8xx series PMICs (excluding the
rk808), it is sometimes desirable to not boot whenever the device is
plugged in. An example would be for the Odroid Go Advance.

This provides a configurable option to check the PMIC says it was
powered because of a plug-in event. If the value is 1 and this option
is selected, the device shuts down shortly after printing a message
to console stating the reason why it's shutting down. Powering up the
board with the power button is not affected.

This patch parallels the work done in the following patch series:
https://lore.kernel.org/u-boot/20220121133732.2397273-1-andre.przywara@arm.com/

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>

arch/arm/mach-rockchip/Kconfig

@@ -361,6 +361,16 @@ config ROCKCHIP_BOOT_MODE_REG
 	  The Soc will enter to different boot mode(defined in asm/arch-rockchip/boot_mode.h)
 	  according to the value from this register.
 
+config ROCKCHIP_RK8XX_DISABLE_BOOT_ON_POWERON
+	bool "Disable device boot on power plug-in"
+	depends on PMIC_RK8XX
+	default n
+	---help---
+	  Say Y here to prevent the device from booting up because of a plug-in
+	  event. When set, the device will boot briefly to determine why it was
+	  powered on, and if it was determined because of a plug-in event
+	  instead of a button press event it will shut back off.
+
 config ROCKCHIP_STIMER
 	bool "Rockchip STIMER support"
 	default y