mb/intel/jslrvp: Update PMC as hidden device

This change allows treating the PMC as a 'hidden' PCI device on
JasperLake, so that the MMIO & I/O resources can be exposed as
belonging to this device, instead of the system agent and LPC/eSPI.

Original patch for jasperlake SoC here:
CB:42018

This change was missing for JasperLake rvp board.

TEST=Checked PMC init function is called and also checked PCI resource
for PMC device 1f.2.

Change-Id: I7531d32c62d3f9735938f744f2892ab9c9bebddf
Signed-off-by: Maulik V Vaghela <maulik.v.vaghela@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45793
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Ronak Kanabar <ronak.kanabar@intel.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
diff --git a/src/mainboard/intel/jasperlake_rvp/variants/jslrvp/devicetree.cb b/src/mainboard/intel/jasperlake_rvp/variants/jslrvp/devicetree.cb
index f8fea47..fc96719 100644
--- a/src/mainboard/intel/jasperlake_rvp/variants/jslrvp/devicetree.cb
+++ b/src/mainboard/intel/jasperlake_rvp/variants/jslrvp/devicetree.cb
@@ -466,7 +466,7 @@
 		end # GSPI #1
 		device pci 1f.0 on  end # eSPI Interface
 		device pci 1f.1 on  end # P2SB
-		device pci 1f.2 on  end # Power Management Controller
+		device pci 1f.2 hidden end # Power Management Controller
 		device pci 1f.3 on  end # Intel HDA
 		device pci 1f.4 on  end # SMBus
 		device pci 1f.5 on  end # PCH SPI