This patch mainly does the following:
- Replace prefix RT_VM_ with VIRTUAL_.
- Remove the check of "addr != RT_VM_PM1A_CNT_ADDR" as the handler is specific for this addr.
- Add comments about the meaning of return value.
Tracked-On: #2865
Signed-off-by: Kaige Fu <kaige.fu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>