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/board.c b/board/sunxi/board.c
index 386e2e0..1cc39e4 100644
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -422,6 +422,12 @@
 	clock_twi_onoff(4, 1);
 #endif
 #endif
+
+#ifdef CONFIG_R_I2C_ENABLE
+	clock_twi_onoff(5, 1);
+	sunxi_gpio_set_cfgpin(SUNXI_GPL(0), SUN8I_H3_GPL_R_TWI);
+	sunxi_gpio_set_cfgpin(SUNXI_GPL(1), SUN8I_H3_GPL_R_TWI);
+#endif
 }
 
 #ifdef CONFIG_SPL_BUILD