mb/starlabs/lite: Enable P2SB

Enable the P2SB so that the SPI is discoverable by the OS.

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I9c12161d4868deae5b8900cfa2f42517a9f0b7e8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66977
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/starlabs/lite/variants/glk/devicetree.cb

@@ -65,6 +65,7 @@ chip soc/intel/apollolake
 				device generic 0 on end
 			end
 		end
+		device ref p2sb		on  end
 		device ref fast_spi	on  end
 		device ref hda		on  end
 		device ref heci1	on  end

src/mainboard/starlabs/lite/variants/glkr/devicetree.cb

@@ -65,6 +65,7 @@ chip soc/intel/apollolake
 				device generic 0 on end
 			end
 		end
+		device ref p2sb		on  end
 		device ref fast_spi	on  end
 		device ref hda		on  end
 		device ref heci1	on  end