drm/i915/chv: Enable Render Standby (RC6) for Cherryview

drm/i915/chv: Enable Render Standby (RC6) for Cherryview

v2: Configure PCBR if BIOS fails allocate pcbr (deepak)

v3: Fix PCBR condition check during CHV RC6 Enable flag set

v4: Fixup PCBR comment msg. (Chris)
    Rebase against latest code (Deak)
    Fixup Spurious hunk (Ben)

v5: Fix PCBR and commentis msg (mika)

v6: Rebase patch on latest nightly (Deepak)

Signed-off-by: Deepak S <[email protected]>
Acked-by: Ben Widawsky <[email protected]>
Reviewed-by: Mika Kuoppala <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>