drm/via: drop use of DRM(READ|WRITE) macros

The DRM_READ, DRM_WRITE macros comes from the deprecated drm_os_linux.h
header file. Remove their use to remove this dependency.

Replace the use of the macros with static inline variants.

v4:
- Use a more standard via_write8_mask() function (Emil)

v3:
- Use static inline functions, rather than macros (Emil)
- Use dedicated mask variants for byte access (Emil)

Signed-off-by: Sam Ravnborg <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Cc: Kevin Brace <[email protected]>
Cc: Thomas Hellstrom <[email protected]>
Cc: "Gustavo A. R. Silva" <[email protected]>
Cc: Mike Marshall <[email protected]>
Cc: Ira Weiny <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Michel Dänzer <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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