xhci: remove unnecessary xhci_quiesce call before xhci_halt

Fist function called in xhci_halt is xhci_quiesce, so no point
in calling it twice.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: Ia90cf475e139de6c594f3fc3f7cbe65568f962df
Git-commit: cf5d344e13655df2fcb049ae212fe59c617349a7
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


[hemantk@codeaurora.org: resolved merge conflict]
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
Signed-off-by: Jack Pham <jackp@codeaurora.org>