usb: xhci: relocate pre-allocation initialization

usb: xhci: relocate pre-allocation initialization

Move pre-allocation initialization from xhci_mem_init() to xhci_init().
This change is part of an ongoing effort to separate initialization from
allocation within the xhci driver. By doing so, it will enable future
patches to re-initialize xhci driver memory without the necessity of fully
recreating it.

Additionally, compliance mode recovery initialization has been adjusted to
only occur after successful memory allocation.

Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20250515135621.335595-4-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>