i2c: sprd: Prevent i2c accesses after suspend is called

i2c: sprd: Prevent i2c accesses after suspend is called

[ Upstream commit da33aa03fa34c918faf2c371ebda0dd961d7ccb2 ]

Add one flag to indicate if the i2c controller has been in suspend state,
which can prevent i2c accesses after i2c controller is suspended following
system suspend.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>