sb/intel/bd82x6x: Use HPTS() for HPET visibility

Platforms with bd82x6x do not initialise OSYS, so HPET is
always hidden.

The two boards lenovo/x201 and packardbell/ms2290 using
sb/intel/ibexpeak but still including <bd8x62x/acpi/lpc.asl>
initialised OSYS using _OSI() method and showed HPET selectively.

Change-Id: I02fffd439be2a5a9d22afd67e68abce888361214
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49486
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/southbridge/intel/bd82x6x/acpi/lpc.asl

@@ -83,17 +83,7 @@ Device (LPCB)
 
 		Method (_STA, 0)	// Device Status
 		{
-			If (HPTE) {
-				// Note: Ancient versions of Windows don't want
-				// to see the HPET in order to work right
-				If (LGreaterEqual(OSYS, 2001)) {
-					Return (0xf)	// Enable and show device
-				} Else {
-					Return (0xb)	// Enable and don't show device
-				}
-			}
-
-			Return (0x0)	// Not enabled, don't show.
+			Return (\HPTS(HPTE))
 		}
 
 		Method (_CRS, 0, Serialized) // Current resources