usb: host: xhci: Fix bound check for interrupter number

Since max_interrupters flag includes primary interrupter as well,
update the bound check when this flag is being used for
secondary event ring clean-up/allocation.

Change-Id: I044c5a89fe17779eb847981cbf27e99b97e37d80
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>