drm/xe/rtp: Split action and entry flags

Entry flags is meant for the whole entry, including the rule
evaluation. Action flags are for flags applied to the register or
action being taken. Since there's only one action per entry, the
distinction was not important and a u8 was spared. However more and more
workarounds are needing multiple actions. This prepares for multiple
action support.

Right now there are these action flags:

 - XE_RTP_ACTION_FLAG_MASKED_REG: register in the action is a masked
   register
 - XE_RTP_ACTION_FLAG_ENGINE_BASE: the engine base should be added to
   the register in order to form the real address

And this entry flag:

 - XE_RTP_ENTRY_FLAG_FOREACH_ENGINE: the rules should be evaluated for
   each engine on the gt. It also automatically implies
   XE_RTP_ACTION_FLAG_ENGINE_BASE.

Since there are likely not that many rules, reduce n_rules to u8 so the
overall entry size doesn't increase more than needed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>