cpu/intel/model_206ax: Rename `cX_acpower` options

They aren't specific to AC power operation anymore. Also adapt autoport.

Change-Id: Ib04d0a08674b7d2773d440d39bd6dfbd4359e0fb
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49089
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/lenovo/t420/devicetree.cb b/src/mainboard/lenovo/t420/devicetree.cb
index 6b0ed3b..ffd1d24 100644
--- a/src/mainboard/lenovo/t420/devicetree.cb
+++ b/src/mainboard/lenovo/t420/devicetree.cb
@@ -21,9 +21,9 @@
 			device lapic 0x0 on end
 			device lapic 0xacac off end
 
-			register "c1_acpower" = "1"	# ACPI(C1) = MWAIT(C1)
-			register "c2_acpower" = "3"	# ACPI(C2) = MWAIT(C3)
-			register "c3_acpower" = "5"	# ACPI(C3) = MWAIT(C7)
+			register "acpi_c1" = "1"	# ACPI(C1) = MWAIT(C1)
+			register "acpi_c2" = "3"	# ACPI(C2) = MWAIT(C3)
+			register "acpi_c3" = "5"	# ACPI(C3) = MWAIT(C7)
 		end
 	end