ufs: Add a PCI based UFS controller driver

This adds a simple PCI based UFS controller driver with a QEMU
emulated UFS controller on the PCI bus.

Requiring QEMU v8.2+.

Signed-off-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Neha Malcom Francis <n-francis@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>