novatel-lte: revert to original plugin library name

Commit f9c63bfa0 "build,plugins: update build rules" accidentally
changed the Novatel LTE plugin from 'libmm-plugins-novatel-lte.so' to
'libmm-plugins-novatel_lte.so'. The name becomes inconsistent with other
plugin names.

This patch has been submitted to upstream:
https://lists.freedesktop.org/archives/modemmanager-devel/2017-April/004398.html

BUG=chromium:707896
TEST=Verify that libmm-plugin-novatel-lte.so is installed.

Change-Id: Ie5ad7c060366141bab32855760df2c61744995de
Reviewed-on: https://chromium-review.googlesource.com/466686
Commit-Ready: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/plugins/Makefile.am b/plugins/Makefile.am
index 596866b..2a4ff2b 100644
--- a/plugins/Makefile.am
+++ b/plugins/Makefile.am
@@ -720,7 +720,7 @@
 # plugin: novatel lte
 ################################################################################
 
-pkglib_LTLIBRARIES += libmm-plugin-novatel_lte.la
+pkglib_LTLIBRARIES += libmm-plugin-novatel-lte.la
 libmm_plugin_novatel_lte_la_SOURCES = \
 	novatel/mm-plugin-novatel-lte.c \
 	novatel/mm-plugin-novatel-lte.h \