drm/i915/cnl: Remove unnecessary check in cnl_setup_private_ppat
There is no need check if PPGTT is disabled because that not possible in CNL. Execlists and GuC submission modes rely on at least aliasing PPGTT and even intel_sanitize_enable_ppgtt says: "We don't allow disabling PPGTT for gen9+ as it's a requirement for execlists, the sole mechanism available to submit work." Suggested-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Michel Thierry <michel.thierry@intel.com> Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171027223207.7869-1-michel.thierry@intel.com
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