sunxi: orangepi_pc: Add support for eMMC found on the Orange Pi PC Plus

The Plus variant of the Orange Pi PC has an eMMC, add support for this.

Note we are using the same u-boot defconfig / dts for both the regular
Orange Pi PC as well as the Orange Pi PC Plus.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Acked-by: NIan Campbell <ijc@hellion.org.uk>

configs/orangepi_pc_defconfig

@@ -4,6 +4,8 @@ CONFIG_MACH_SUN8I_H3=y
 CONFIG_DRAM_CLK=624
 CONFIG_DRAM_ZQ=3881979
 CONFIG_DRAM_ODT_EN=y
+CONFIG_MMC0_CD_PIN="PF6"
+CONFIG_MMC_SUNXI_SLOT_EXTRA=2
 # CONFIG_VIDEO is not set
 CONFIG_DEFAULT_DEVICE_TREE="sun8i-h3-orangepi-pc"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set