intel/apollolake_rvp: Add sleepstates.asl to dsdt

cat /sys/power/state should show supported sleep states as freeze and 
mem where freeze is "Suspend to Idle" and mem is "Suspend to RAM"

Change-Id: Ia72aaf6642dcdc9106c1992af3cf6cb21a8fff4a
Signed-off-by: Hannah Williams <hannah.williams@intel.com>
Reviewed-on: https://review.coreboot.org/14285
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed