libs/devicemodel: Fix dependency with libxencall

libxendevicemodel.so do depends on libxencall.so but the dependency was
missing at link time.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Release-acked-by: Julien Grall <julien.grall@arm.com>

tools/libs/devicemodel/Makefile

@@ -63,7 +63,7 @@ libxendevicemodel.so.$(MAJOR): libxendevicemodel.so.$(MAJOR).$(MINOR)
 	$(SYMLINK_SHLIB) $< $@
 
 libxendevicemodel.so.$(MAJOR).$(MINOR): $(PIC_OBJS) libxendevicemodel.map
-	$(CC) $(LDFLAGS) $(PTHREAD_LDFLAGS) -Wl,$(SONAME_LDFLAG) -Wl,libxendevicemodel.so.$(MAJOR) $(SHLIB_LDFLAGS) -o $@ $(PIC_OBJS) $(LDLIBS_libxentoollog) $(APPEND_LDFLAGS)
+	$(CC) $(LDFLAGS) $(PTHREAD_LDFLAGS) -Wl,$(SONAME_LDFLAG) -Wl,libxendevicemodel.so.$(MAJOR) $(SHLIB_LDFLAGS) -o $@ $(PIC_OBJS) $(LDLIBS_libxentoollog) $(LDLIBS_libxencall) $(APPEND_LDFLAGS)
 
 .PHONY: install
 install: build