soc/intel/common/block/pcie/rtd3: Add optional _OFF and _ON skip control

- Optional feature to provide mechanism to skip _OFF and _On execution.
- It is used for the device to skip _OFF and _ON during device driver
  reload.
- OFSK is used to skip _OFF Method at the end of device driver removal.
- ONSK is used to skip _ON Method at the beginning of driver loading.
- General flow use case:
  1. Device driver is removed by 'rmmod' command.
  2. Device _RST is called. _RST perform reset.
  3. Device increments OFSK in _RST to skip the following _OFF invoked by
     OSPM.
  4. OSPM invokes _OFF at the end of driver removal.
  5. _OFF sees OFSK and skips current execution and decrements OFSK so that
     _OFF will be executed normally next time.
  6. _OFF increments ONSK to skip the following _ON invoked by OSPM.
  7. Device driver is reloaded by 'insmod/modprobe' command.
  8. OSPM invokes _ON at the beginning of driver loading.
  9. _ON sees ONSK and skip current execution and decrements ONSK so that
     _ON will be executed normally next time.

- In normal case:
When suspend, OSPM invokes _OFF. Since OFSK is zero, the device goes
to deeper state as expected.

When resume, OSPM invokes _ON. Sinc ONSK is zero, the device goes
to active state as expected.

- Generated changes:

        PowerResource (RTD3, 0x00, 0x0000)
            Name (ONSK, Zero)
            Name (OFSK, Zero)
            ...

            Method (_ON, 0, Serialized)  // _ON_: Power On
            {
                If ((ONSK == Zero))
                {
                    ...
                }
                Else
                {
                    ONSK--
                }
                        }

            Method (_OFF, 0, Serialized)  // _OFF: Power Off
            {
               If ((OFSK == Zero))
                {
                    ...
                }
                Else
                {
                    OFSK--
                    ONSK++
                }
            }

Test:
Enable and verify OFSK and ONSK Name objects and the if-condition logic
inside _OFF and _ON metheds is added.

Signed-off-by: Cliff Huang <cliff.huang@intel.com>
Change-Id: Ic32d151d65107bfc220258c383a575e40a496b6f
---
M src/soc/intel/common/block/pcie/rtd3/chip.h
M src/soc/intel/common/block/pcie/rtd3/rtd3.c
2 files changed, 62 insertions(+), 0 deletions(-)