v2024.07-rc4 issues on VisionFive v2

[Conor Dooley]

Hey,

After going from Vendor SPL/OpenSBI/U-Boot to OpenSBI v1.4++ plus
v2024.07-rc4 SPL/U-Boot I ran into a boot loop problem relating to
PCI:
	U-Boot 2024.07-rc4 (Jun 13 2024 - 15:09:34 +0100)
	
	CPU:   sifive,u74-mc
	Model: StarFive VisionFive 2 v1.2A
	DRAM:  4 GiB
	Core:  136 devices, 26 uclasses, devicetree: board
	WDT:   Not starting watchdog at 13070000
	MMC:   mmc at 16010000: 0, mmc at 16020000: 1
	Loading Environment from SPIFlash... SF: Detected gd25lq128 with page size 256 Bytes, erase size 4 KiB, total 16 MiB
	OK
	StarFive EEPROM format v2
	
	--------EEPROM INFO--------
	Vendor : StarFive Technology Co., Ltd.
	Product full SN: VF7110A1-2249-D004E000-00000540
	data version: 0x2
	PCB revision: 0xa1
	BOM revision: A
	Ethernet MAC0 address: 6c:cf:39:00:17:95
	Ethernet MAC1 address: 6c:cf:39:00:17:96
	--------EEPROM INFO--------
	
	starfive_7110_pcie pcie at 2b000000: Starfive PCIe bus probed.
	starfive_7110_pcie pcie at 2c000000: Starfive PCIe bus probed.
	In:    serial at 10000000
	Out:   serial at 10000000
	Err:   serial at 10000000
	Net:   eth0: ethernet at 16030000, eth1: ethernet at 16040000
	starting USB...
	Bus xhci_pci: Register 5000420 NbrPorts 5
	Starting the controller
	USB XHCI 1.00
	scanning bus xhci_pci for devices... 
	U-Boot SPL 2024.07-rc4 (Jun 13 2024 - 15:09:34 +0100)
	DDR version: dc2e84f0.
	Trying to boot from SPI

This only appeared after I refreshed the environment by running.
`env default -a -f; env save`. Before that things worked "fine", I
suppose because nothing actually touched PCI. I've just disabled
PCI for now and things are working once more. I've not attempted
to bisect/debug this, cos that's not the fastest process while
running U-Boot out of flash.

In case it is relevant, the board I have is one of the "super early
bird" ones.

Cheers,
Conor.
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