mmc: cmdq_hci: Add atomic context support in certain cmdq APIs

cmdq_halt and cmdq_disable gets called from cmdq_irq in case
of error. Thus add cmdq_disable_nosync and unhalt support
in cmdq_halt_poll which can be called from irq context.

Change-Id: I172e0e29a5584f02dd96c8af5ea1b97dc8c46083
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>