Revert "i965/icl: Add WA_2204188704 to disable pixel shader panic dispatch"

Revert "i965/icl: Add WA_2204188704 to disable pixel shader panic dispatch"

SLICE_COMMON_CHICKEN3 is a privileged register not accesible from userspace.
This patch silences a simulator warning about it.

We don't need to add this workaround in linux kernel as the WA description
says it's fixed on latest stepping.

This reverts commit 85ecd14ef6a084f5e82860de6dbc79870b335682.

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>