linux-imx

MLK-16713 i2c: imx-lpi2c: add runtime pm support

- Add runtime pm support to dynamicly manage the ipg and per clocks.
- Put the suspend to suspend_noirq.
- Call .pm_runtime_force_suspend() to force runtime pm suspended
  in .suspend_noirq().

BuildInfo:
  - SCFW 88456c73, IMX-MKIMAGE 06bc2767, ATF a438801
  - U-Boot 2017.03-imx_v2017.03_4.9.51_imx8_beta1+g7953d47

Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Gao Pan <pandy.gao@nxp.com>
Reviewed-by: Anson Huang <Anson.Huang@nxp.com>

During 4.14 rebase added pm_runtime_get_sync/pm_runtime_put around
the reading of LPI2C_PARAM.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
(Vipul: Fixed merge conflicts)
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
(cherry picked from commit 31cc4be3e80a53d890657a06458e04c1527313a9)