i2c: st: use pm_sleep_ptr to avoid ifdef CONFIG_PM_SLEEP

Rely on pm_sleep_ptr when setting the pm ops and get rid
of the ifdef CONFIG_PM_SLEEP around suspend/resume functions.

Signed-off-by: Alain Volmat <avolmat@me.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
1 file changed