Revert "USB/host: Cleanup unneccessary irq disable code"

Revert "USB/host: Cleanup unneccessary irq disable code"

This reverts commit 2fd35e76bb4d61bc6f1bb6b77c4df8486521a1a2.

Martin Steigerwald reported that this change caused a hard lockup when
using USB if threadirqs are enabled.  Thomas pointed out that this patch
is incorrect, and can cause problems.  So revert it to get the
previously working functionality back.

Reported-by: Martin Steigerwald <Martin@lichtvoll.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Chuansheng Liu <chuansheng.liu@intel.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>