drm/xe: Assume MTL's forcewake register continues to future platforms

Starting with MTL, the GT forcewake ack register moved from 0x130044 to 0xDFC. We expect this change to carry forward to future platforms as well, so forcewake initialization should use an IP version check instead of matching the MTL platform specifically.

The (re)definition of FORCEWAKE_ACK_GT_MTL in the forcewake file is also unnecessary; we can take the definition that already exists in the dedicated register header.

Bspec: 65031, 64629 Signed-off-by: Matt Roper matthew.d.roper@intel.com