drm/i915/icl: program mbus during pipe enable

drm/i915/icl: program mbus during pipe enable

This patch program default values of MBus credit during pipe enable.

Changes Since V1:
 - Add WARN_ON (Paulo)
 - Remove TODO comment
 - Program 0 during pipe disable
 - Rebase
Changes since V2:
 - We don't need to do anything when disabling the pipe
Changes since V3 (from Paulo):
 - Remove WARN() that we'll never be able to trigger (Ville).

Cc: Ville Syrjälä <[email protected]>
Reviewed-by: Paulo Zanoni <[email protected]>
Reviewed-by: James Ausmus <[email protected]>
Signed-off-by: Mahesh Kumar <[email protected]>
Signed-off-by: Paulo Zanoni <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]