audio: hal:Rename audiohal library name

At the start, hack was made in bitbake file to
install audio.primary.default.so library in final
image as part of intial LE HAL bringup.
To avoid hack renaming audiohal library name from
audio_primary_default.la to audio.primary.default.la.

Change-Id: If0e64671fb41aef2ca8a7ac40eab413f726ce43f
diff --git a/hal/Makefile.am b/hal/Makefile.am
index e648453..bc71c50 100644
--- a/hal/Makefile.am
+++ b/hal/Makefile.am
@@ -185,7 +185,7 @@
 library_include_HEADERS = $(h_sources)
 library_includedir = $(includedir)
 
-lib_LTLIBRARIES = audio_primary_default.la
+lib_LTLIBRARIES = audio.primary.default.la
 audio_primary_default_la_SOURCES = $(c_sources)
 audio_primary_default_la_LIBADD = $(GLIB_LIBS) -llog -lcutils -ltinyalsa
 audio_primary_default_la_LIBADD += -ltinycompress -laudioroute -ldl -lexpat -laudioutils