stop installing manager header

Stop installing the manager header as it is no longer meant to be
exported, but rather used only internally within this repository.

Change-Id: I2ab21a31fd745e1b3e36fc39ffea5e26d373ff51
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/Makefile.am b/Makefile.am
index ddca382..1008449 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -27,10 +27,7 @@
 	-flto
 
 nobase_include_HEADERS = \
-	blobs-ipmid/blobs.hpp \
-	blobs-ipmid/manager.hpp \
-	blobs-ipmid/test/blob_mock.hpp \
-	blobs-ipmid/test/manager_mock.hpp
+	blobs-ipmid/blobs.hpp
 
 # Install the blob handlers in ipmid-providers so you can leverage
 # meta-phosphor/blob/master/classes/obmc-phosphor-ipmiprovider-symlink.bbclass