soc/intel/skylake: Add _SEG/_UID name variables

TEST=Build and boot EVE and Soraka to OS.

Change-Id: Ic765dc2a7a522872ee991e47e3608f60a0e6411a
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38513
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/skylake/acpi/systemagent.asl b/src/soc/intel/skylake/acpi/systemagent.asl
index c4d8a70..920062c 100644
--- a/src/soc/intel/skylake/acpi/systemagent.asl
+++ b/src/soc/intel/skylake/acpi/systemagent.asl
@@ -17,8 +17,10 @@
 
 #include <soc/iomap.h>
 
-Name (_HID, EISAID ("PNP0A08"))	/* PCIe */
-Name (_CID, EISAID ("PNP0A03"))	/* PCI */
+Name (_HID, EisaId ("PNP0A08") /* PCI Express Bus */)  // _HID: Hardware ID
+Name (_CID, EisaId ("PNP0A03") /* PCI Bus */)  // _CID: Compatible ID
+Name (_SEG, Zero)  // _SEG: PCI Segment
+Name (_UID, Zero)  // _UID: Unique ID
 
 Device (MCHC)
 {