soc/intel/skylake: check DPTF_TSR0_ACTIVE_AC* in _ACx methods

soc/intel/skylake: check DPTF_TSR0_ACTIVE_AC* in _ACx methods

Because thermal table is not included the values of DPTF_TSR0_ACTIVE_AC5
and DPTF_TSR0_ACTIVE_AC6 from internal nami/vayne thermal team.
Add conditional compilation in _ACx methods if DPTF_ENABLE_FAN_CONTROL
is defined in the dptf.asl.

BUG=b:72974136
BRANCH=poppy
TEST=emerge-nami coreboot and booted on nami board.

Change-Id: I3e36ce94f714ff13f8ccee65992d7a9c7e0bb5b2
Signed-off-by: Frank Wu <frank_wu@compal.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/25614
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>