build: cleanup makefile whitespace

Cleanup the mix of tabs and spaces in the makefile, s.t the lists of
files and parameters are cleanly and uniformly indented.

Change-Id: Iceb9feb7f6c62b97bc6c1c4686ec1ba49d7bf143
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/Makefile.am b/Makefile.am
index 60b8e42..9956d51 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2,14 +2,17 @@
 
 libfirmwareblobdir = ${libdir}/ipmid-providers
 libfirmwareblob_LTLIBRARIES = libfirmwareblob.la
-libfirmwareblob_la_SOURCES = main.cpp \
-		      firmware_handler.cpp \
-		      static_handler.cpp \
-		      lpc_handler.cpp \
-		      pci_handler.cpp
-libfirmwareblob_la_LDFLAGS = $(PHOSPHOR_LOGGING_LIBS) \
-                        -version-info 0:0:0 -shared
-libfirmwareblob_la_CXXFLAGS = $(PHOSPHOR_LOGGING_CFLAGS) \
-                         -flto
+libfirmwareblob_la_SOURCES = \
+	main.cpp \
+	firmware_handler.cpp \
+	static_handler.cpp \
+	lpc_handler.cpp \
+	pci_handler.cpp
+libfirmwareblob_la_LDFLAGS = \
+	$(PHOSPHOR_LOGGING_LIBS) \
+	-version-info 0:0:0 -shared
+libfirmwareblob_la_CXXFLAGS = \
+	$(PHOSPHOR_LOGGING_CFLAGS) \
+	-flto
 
 SUBDIRS = . test