configs: NVMe/USB target boot devices on VisionFive 2

Make NVMe and USB target boot devices on the StarFive VisionFive 2 board.
The boot devices are sorted by decreasing device speed.

CONFIG_PCI_INIT_R=y is set via [1]. 'start usb' is added to CONFIG_PREBOOT
by the same patch.

[1] [PATCH v1 1/2] configs: starfive: Enable PCIE auto enum and NVME/USB stuff for Starfive Visionfive 2
    https://lore.kernel.org/u-boot/TY3P286MB2611C9AD6E5BB3756A959E89981FA@TY3P286MB2611.JPNP286.PROD.OUTLOOK.COM/

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/include/configs/starfive-visionfive2.h b/include/configs/starfive-visionfive2.h
index 4ee02b8..6fa7f16 100644
--- a/include/configs/starfive-visionfive2.h
+++ b/include/configs/starfive-visionfive2.h
@@ -18,6 +18,8 @@
 /* Environment options */
 
 #define BOOT_TARGET_DEVICES(func) \
+	func(NVME, nvme, 0) \
+	func(USB, usb, 0) \
 	func(MMC, mmc, 1) \
 	func(DHCP, dhcp, na)