firmware: set up hash handler

Treat the hash file as just another file.  It isn't just another file in
some contexts, but in writing data down it is.

Change-Id: I173b6d2a7d7da2db628e8b27ce58b64aea6b932a
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/Makefile.am b/Makefile.am
index 9956d51..7455b4d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -7,7 +7,8 @@
 	firmware_handler.cpp \
 	static_handler.cpp \
 	lpc_handler.cpp \
-	pci_handler.cpp
+	pci_handler.cpp \
+	hash_handler.cpp
 libfirmwareblob_la_LDFLAGS = \
 	$(PHOSPHOR_LOGGING_LIBS) \
 	-version-info 0:0:0 -shared