drm fixes for 5.5-rc5

agp:
- two unused variable removed

amdgpu:
- ATPX regression fix
- SMU metrics table locking fixes
- gfxoff fix for raven
- RLC firmware loading stability fix

mediatek:
- external display fix
- dsi timing fix

sun4i:
- Fix double-free in connector/encoder cleanup (Stefan)

maildp:
- Make vtable static (Ben)
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