mmc: cmdq_hci: Add retry mechanism for cmdq_halt

Currently all functions which calls cmdq_halt relies upon HALT
to pass other wise considers it as a FATAL error (like clk scaling).

So add retry mechanism in halt - retry if halt completion
timesout & HALT also did not complete(by doing register read).

Change-Id: I59e199681e46085f804636f4c07249e6f21de1d5
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>