Remove libSR_AudioIn from base.mk

This is an obsolete rule that was grandfathered in because
it was a USER module at some point. It's no longer
required, even by builds that use packages/app/VoiceDialer.

Change-Id: Ife9e89bd1b03c0364e27650863a83bad945b8089
diff --git a/target/product/base.mk b/target/product/base.mk
index 68babad..68e3ff3 100644
--- a/target/product/base.mk
+++ b/target/product/base.mk
@@ -35,7 +35,6 @@
     fsck_msdos \
     ime \
     javax.obex \
-    libSR_AudioIn \
     libandroid \
     libandroid_runtime \
     libandroid_servers \