i2c-msm-v2: wait for qup core to be in valid state after reset

Failure to wait until state transition is complete before accessing
QUP registers or turning off the clock may cause bus error and
even a crash. Additionally, the bam tags data must be flushed prior
to being disconnected at the end of transfer. Failure to do so may
result in unexpected behavior.

Change-Id: Ife423df8752cc318e8e24bef588bd69ebff26ab1
Signed-off-by: Ankit Gupta <ankgupta@codeaurora.org>