Various SOC15 macro cleanups

These replace some of the more verbose patterns with new SOC15 macros.  Should
be no functional change to anything.

Follow-Ups:
- Various SOC15 macro cleanups
  - From: Alex Deucher
- [PATCH 10/10] drm/amd/amdgpu: Port VCN over to new SOC15 macros
  - From: Tom St Denis
- [PATCH 09/10] drm/amd/amdgpu: Port PSP v10.0 over to new SOC15 macros
  - From: Tom St Denis
- [PATCH 08/10] drm/amd/amdgpu: Port PSP v3.1 over to new SOC15 macros
  - From: Tom St Denis
- [PATCH 07/10] drm/amd/amdgpu: Port NBIO v7.0 driver over to new SOC15 macros
  - From: Tom St Denis
- [PATCH 06/10] drm/amd/amdgpu: Port NBIO v6.1 driver over to new SOC15 macros
  - From: Tom St Denis
- [PATCH 05/10] drm/amd/amdgpu: Port UVD 7.0 over to new SOC15 macros
  - From: Tom St Denis
- [PATCH 04/10] drm/amd/amdgpu: Port MMHUB over to new SOC15 macros
  - From: Tom St Denis
- [PATCH 03/10] drm/amd/amdgpu: Cleanup gfxhub read-modify-write patterns
  - From: Tom St Denis
- [PATCH 02/10] drm/amd/amdgpu: Port GFXHUB over to new SOC15 macros
  - From: Tom St Denis
- [PATCH 01/10] drm/amd/amdgpu: Add offset variant to SOC15 macros
  - From: Tom St Denis