Indicating unused parameters as LE_UNUSED
Indicating unused parameters as LE_UNUSED

Resolve compilation error by indicating unused parametes of functions
as LE_UNUSED when LE_CONFIG_RPC config is not enabled.

Resolves: LE-16114
Change-Id: If34c39d0774887663eed156efa7d36f77cd97810

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