[fwupdate] Fix PA usage on Linux
[fwupdate] Fix PA usage on Linux

A change for rc76 resulted in le_fwupdate calls on Linux to
hit the default PA instead of the actual PA.

Resolves: LE-14135
Related: LE-13483
Change-Id: I0cbf5bf6f0260aa9b9b687de7426277ed09b8e1a

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af