i2c-msm-v2: Fix for unhandle IRQ

I2C msm v2 driver handle scenario where runtime
PM is not enabled and enables clocks explicitly.
I2C qup driver handle scenario where runtime
PM is not enabled and enables clocks explicitly.
But it checks runtime PM suspended state in ISR
routine before processing further which can lead to
issue of unhandled valid IRQ sometimes because I2C
client can initiate transaction very early after system
resume and runtime PM is not enabled.

Add atomic flag to synchronize between active transaction
request when clocks are enabled and ISR.

CRs-Fixed: 671063
Change-Id: Ic57afe0cfb0815746d9590157fbdde6ea53b9c18
Signed-off-by: Sana Venkat Raju <c_vsana@codeaurora.org>
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>