mb/starlabs/lite/{glk,glkr}: Enable PMC

Enable PMC in devicetree so that resources are allocated properly
for it.

Tested on StarLite Mk III & IV, and both can power on correctly.

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: Ib4384b55751a9979e470dd04f6814d4ca170ff34
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67409
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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 pmc		on  end
 		device ref p2sb		on  end
 		device ref fast_spi	on  end
 		device ref sram		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 pmc		on  end
 		device ref p2sb		on  end
 		device ref fast_spi	on  end
 		device ref sram		on  end