Add blkid to all builds for use by vold.

vold now uses blkid to extract UUID and label information from
inserted physical devices.

Bug: 11175082
Change-Id: I56ebe733ff85a498f6d3cbdcf21d40ddc6123f82
diff --git a/target/product/base.mk b/target/product/base.mk
index c8f4354..0959fb4 100644
--- a/target/product/base.mk
+++ b/target/product/base.mk
@@ -23,6 +23,7 @@
     android.test.runner \
     app_process \
     applypatch \
+    blkid \
     bmgr \
     bugreport \
     content \