xhci: add handler for only one interrupt line

xhci: add handler for only one interrupt line

Current xHCI driver only supports one "interrupter", meaning we will
only use one MSI/MSI-X interrupt line. Thus, add handler only to the
first interrupt line.

Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
Co-developed-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20231201150647.1307406-13-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>