systemd: Point to target binary paths for loadkeys and setfont

with newer systemd, if not specified, these paths are searched on build
host /usr dir

log.do_configure.2373278:Program /usr/sbin/loadkeys found: YES (/usr/sbin/loadkeys)
log.do_configure.2373278:Program /usr/sbin/setfont found: YES (/usr/sbin/setfont)

and if build host happens to have kbd installed then it
uses those locations, this would work fine if the assumption between OE
distro and host distro matches but fail otherwise e.g. on archlinux
these binaries are in /usr/sbin but in OE they are in ${base_bindir}

This results in
qemux86-64 systemd-vconsole-setup[211]: /usr/sbin/loadkeys failed with exit status 1.

(From OE-Core rev: 94ccc7acc4a871f5bb7ab8e135e70b5519eff6ad)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Luca Boccassi <luca.boccassi@microsoft.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/systemd/systemd_254.bb

@@ -239,7 +239,9 @@ EXTRA_OEMESON += "-Dnobody-user=nobody \
                   -Dsystem-gid-max=999 \
                   "
 
-# Hardcode target binary paths to avoid using paths from sysroot
+# Hardcode target binary paths to avoid using paths from sysroot or worse
+# it pokes for these binaries on build host and encodes that distro assumption
+# into target
 EXTRA_OEMESON += "-Dkexec-path=${sbindir}/kexec \
                   -Dkmod-path=${base_bindir}/kmod \
                   -Dmount-path=${base_bindir}/mount \
@@ -247,7 +249,9 @@ EXTRA_OEMESON += "-Dkexec-path=${sbindir}/kexec \
                   -Dquotaon-path=${sbindir}/quotaon \
                   -Dsulogin-path=${base_sbindir}/sulogin \
                   -Dnologin-path=${base_sbindir}/nologin \
-                  -Dumount-path=${base_bindir}/umount"
+                  -Dumount-path=${base_bindir}/umount \
+                  -Dloadkeys-path=${base_bindir}/loadkeys \
+                  -Dsetfont-path=${base_bindir}/setfont"
 
 # The 60 seconds is watchdog's default vaule.
 WATCHDOG_TIMEOUT ??= "60"