sunxi: Add support for the I2C controller which is part of the PRCM

Signed-off-by: Jelle van der Waa <jelle@vdwaa.nl>
[hdegoede@redhat.com: Minor cleanups]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

applied with fixing 2 checkpatch warnings:
WARNING: please, no space before tabs

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index 9d67847..7c69be9 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -363,6 +363,12 @@
 	See I2C0_ENABLE help text.
 endif
 
+config R_I2C_ENABLE
+	bool "Enable the PRCM I2C/TWI controller"
+	default n
+	---help---
+	Set this to y to enable the I2C controller which is part of the PRCM.
+
 if MACH_SUN7I
 config I2C4_ENABLE
 	bool "Enable I2C/TWI controller 4"