sdm: hwc2: Set transform correctly

- Use correct mapping for transforms set by client.
- 180 deg can be supported by h_flip|v_flip
- 270 deg can be supported by 90|h_flip|v_flip
- Add transform to HWCLayer dump

Change-Id: I3c160eb42b028b5f02b9dfd45ee18a4cdcf5e0e3
Crs-fixed: 1026496
2 files changed