ec/google/chromeec/ACPI: Set TBMC status based on motion sensor presence

Use ECRAM field MTNS to determine if motion sensor present, and set
TBMC device status accordingly.

TEST=build/boot google/{jinlon,drobit}, verify ACPI status for TMBC
correct for both devices with and without tablet mode.

Change-Id: Ic06ab6d721f0a3435e6dfd7b5e130f378096afec
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75172
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: CoolStar <coolstarorganization@gmail.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>

src/ec/google/chromeec/acpi/tbmc.asl

@@ -15,6 +15,10 @@ Device (TBMC)
 	}
 	Method(_STA, 0)
 	{
-		Return (0xB)
+		If (^^MTNS == 1) {
+			Return (0xF)
+		} Else {
+			Return (0x0)
+		}
 	}
 }