drm/i915/tgl: Extend Wa_1606931601 for all steppings

According to BSpec. Wa_1606931601 applies for all TGL steppings.
This patch moves the WA implementation out of A0 only block of
rcs_engine_wa_init().

The WA is has also been referred to by an alternate name
Wa_1607090982.

Bspec: 46045, 52890

Fixes: 3873fd1a

 ("drm/i915: Use engine wa list for Wa_1607090982")
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200227220101.321671-4-jose.souza@intel.com