mb/google/samus: Set hidden flag for RT5677AA ACPI device

Coolstar's Windows drivers don't utilize it, and the Linux drivers
don't care about _STA, so hide it from Windows to tidy up Device
Manager.

Change-Id: I2eb4b3aeed50b9f3ee9f73a57d6585068aa31fbb
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71198
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/google/auron/variants/samus/include/variant/acpi/mainboard.asl

@@ -230,5 +230,10 @@ Scope (\_SB.PCI0.SPI0)
 				ResourceConsumer,    // ResourceUsage
 			)
 		})
+
+		Method (_STA)
+		{
+			Return (0xB)	//hidden from Windows
+		}
 	}
 }