sunxi: H616: OrangePi Zero 2: enable USB power supply

The OrangePi Zero 2 has a USB VBUS regulator, controlled by pin PC16.
This is correctly described in the DT, but the patches for supporting
this are still pending.

Meanwhile add our good old CONFIG_USB1_VBUS_PIN to the defconfig file,
to enable power on the USB port and allow using a USB flash drive, for
instance.

Fixes: 6acc5fa581b4 ("sunxi: H616: enable USB support for H616 boards")
Reported-by: Mikhail Kalashnikov <iuncuim@gmail.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/configs/orangepi_zero2_defconfig b/configs/orangepi_zero2_defconfig
index f13735e..50009e8 100644
--- a/configs/orangepi_zero2_defconfig
+++ b/configs/orangepi_zero2_defconfig
@@ -8,6 +8,7 @@
 CONFIG_DRAM_SUN50I_H616_TPR10=0xf83438
 CONFIG_MACH_SUN50I_H616=y
 CONFIG_SUNXI_DRAM_H616_DDR3_1333=y
+CONFIG_USB1_VBUS_PIN="PC16"
 CONFIG_R_I2C_ENABLE=y
 CONFIG_SPL_SPI_SUNXI=y
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set