sunxi: Add mmc0 card detect pin for Sinlinx SinA33

Sinlinx SinA33 uses PB4 for mmc0 card detect.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

configs/Sinlinx_SinA33_defconfig

@@ -3,6 +3,7 @@ CONFIG_ARCH_SUNXI=y
 CONFIG_MACH_SUN8I_A33=y
 CONFIG_DRAM_CLK=552
 CONFIG_DRAM_ZQ=15291
+CONFIG_MMC0_CD_PIN="PB4"
 CONFIG_DEFAULT_DEVICE_TREE="sun8i-a33-sinlinx-sina33"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
 CONFIG_SPL=y