usb: host: ehci-msm: Register ULPI PHY through NOP wrapper

The UCLASS_USB device is removed and rebound each time you run "usb stop"
followed by "usb start", or when you switch between USB device and USB host
mode. Unfortunately, this causes issues with the current ehci-msm driver:

In ehci_usb_remove() we call generic_shutdown_phy(), but at that point the
ULPI PHY we registered in ehci_usb_of_bind() was already removed again by
the DM core.

Fix this by adding a UCLASS_NOP driver that keeps the PHY driver bound
permanently, and then just re-probe the actual USB part.

Reported-by: Jianfeng Zhu <[email protected]>
Closes: https://lore.kernel.org/u-boot/OSQPR04MB774067EBEEADD714EFE18C2A90882@OSQPR04MB7740.apcprd04.prod.outlook.com/
Signed-off-by: Stephan Gerhold <[email protected]>
Acked-by: Caleb Connolly <[email protected]>
Tested-by: Sam Day <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Casey Connolly <[email protected]>

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