systemd_sysmocom.inc: Make sure machine-specific systemd.conf is used

We have machine-specific systemd.conf for sysmobts2100 and owhw, but we
didn't add them to SRC_URI so far, resulting in them not being used as
intended.

recipes-fixes/systemd/systemd_sysmocom.inc

@@ -1,7 +1,7 @@
 S_THISDIR := "${@os.path.dirname(d.getVar('FILE', True))}"
 FILESPATH =. "${@base_set_filespath(["${S_THISDIR}/${PN}"], d)}:"
 
-PRINC="25"
+PRINC="26"
 
 SRC_URI += "file://journald.conf \
             file://legacy.conf \
@@ -10,6 +10,8 @@ SRC_URI += "file://journald.conf \
 
 SRC_URI_append_sysmobts-v2 = " file://system.conf"
 SRC_URI_append_sysmocom-odu = " file://system.conf"
+SRC_URI_append_gsmk-owhw = " file://system.conf"
+SRC_URI_append_sysmobts2100 = " file://system.conf"
 
 # We want the journal on the ODU...
 SRC_URI_append_sysmocom-idu = " file://system.conf"