riscv: dts: spacemit: Enable USB3.0 on BananaPi-F3

riscv: dts: spacemit: Enable USB3.0 on BananaPi-F3

Enable the DWC3 USB 3.0 controller and its associated usbphy2 on the
Banana Pi F3 board.

The board utilizes a VLI VL817 hub, which requires two separate power
supplies: one VBUS and one for hub itself. Add two GPIO-controlled
fixed-regulators to manage this.

Tested-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Ze Huang <huang.ze@linux.dev>
Reviewed-by: Yixun Lan <dlan@gentoo.org>
Link: https://lore.kernel.org/r/20260111-k1-usb3dts-v2-v3-3-f5ebd546e904@linux.dev
Signed-off-by: Yixun Lan <dlan@gentoo.org>