usb: host: xhci-plat: fix incorrect type for of_match variable in xhci_plat_probe()

usb: host: xhci-plat: fix incorrect type for of_match variable in xhci_plat_probe()

The variable `of_match` was incorrectly declared as a `bool`.
It is assigned the return value of of_match_device(), which is a pointer of
type `const struct of_device_id *`.

Fixes: 16b7e0cccb243 ("USB: xhci-plat: fix legacy PHY double init")
Signed-off-by: Seungjin Bae <eeodqql09@gmail.com>
Link: https://lore.kernel.org/r/20250619055746.176112-2-eeodqql09@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>