sunxi: Complete mmc pin mux for each supported platform, configured with Kconfig

Sunxi platforms have different possible mmc pin mux setups (except for mmc0),
which are different across platforms.

This lets users configure which is used through the CONFIG_MMC*_PINS Kconfig
options. This is especially relevant when a second (in addition to mmc0) port
is used and CONFIG_MMC_SUNXI_SLOT_EXTRA is enabled.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index 98228e8..ccc2080 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -212,6 +212,25 @@
 	---help---
 	See MMC0_CD_PIN help text.
 
+config MMC1_PINS
+	string "Pins for mmc1"
+	default ""
+	---help---
+	Set the pins used for mmc1, when applicable. This takes a string in the
+	format understood by sunxi_name_to_gpio_bank, e.g. PH for port H.
+
+config MMC2_PINS
+	string "Pins for mmc2"
+	default ""
+	---help---
+	See MMC1_PINS help text.
+
+config MMC3_PINS
+	string "Pins for mmc3"
+	default ""
+	---help---
+	See MMC1_PINS help text.
+
 config MMC_SUNXI_SLOT_EXTRA
 	int "mmc extra slot number"
 	default -1