drm/via: copy DRM_WAIT_ON as VIA_WAIT_ON and use it

VIA_WAIT_ON() is a direct copy of DRM_WAIT_ON() from
drm_os_linux.h.
The copy is made so we can avoid the dependency on the legacy header.
A more involved approach had been to introduce wait_event_* but for this
legacy driver the simpler and more safe approach with a copy of the
macro was selected.
Added the relevant header files for the functions used in VIA_WAIT_ON.

v3:
- Updated users of DRM_WAIT_ON => VIA_WAIT_ON (Emil)
- Updated $subject (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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