openpower-pels: Create guard using libguard

Replace CreateWithEntityPath D-Bus method with guard library calls for
creating guard entries, as CreateWithEntityPath is not an approved dbus
method.

Tested and the guard record is created with the corresponding PEL id

```
before injecting the error
root@p10bmc:~# guard -l
No unresolved records to display

After injecting error, the guard is created using the PEL ID
root@p10bmc:~# guard -l
ID         | ERROR      | Type            | Path
0x00000001 | 0x5000592b | unrecoverable   | physical:sys-0/node-0/proc-0/eq-1/fc-0/core-0
root@p10bmc:~# peltool -l
{
    "0x5000592B": {
        "SRC":                  "BD13E510",
        "Message":              "Error Signature: 0x20DA0020 0x00000001 0x4D740407",
        "PLID":                 "0x5000592B",
        "CreatorID":            "BMC",
        "Subsystem":            "Processor Unit (CPU)",
        "Commit Time":          "10/17/2024 09:54:22",
        "Sev":                  "Unrecoverable Error",
        "CompID":               "bmc hw diags"
    }
}
```

Change-Id: I7531bce403206beaa119aea0a621e6b47d28ffd0
Signed-off-by: deepakala-k <deepakala.karthikeyan@ibm.com>
diff --git a/extensions/openpower-pels/meson.build b/extensions/openpower-pels/meson.build
index db57568..cff4e68 100644
--- a/extensions/openpower-pels/meson.build
+++ b/extensions/openpower-pels/meson.build
@@ -32,6 +32,7 @@
         cpp.find_library('pdbg'),
         cpp.find_library('ekb'),
         cpp.find_library('phal'),
+        cpp.find_library('libguard'),
     ]
     extra_args += [
         '-DPEL_ENABLE_PHAL',