build: drop --enable-lpc-bridge option

Tested: Not tested beyond build verification.
Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I56581665b5f12b2c00dd1debca42a75758a46d94
diff --git a/bmc/Makefile.am b/bmc/Makefile.am
index 8c4ff44..7e03384 100644
--- a/bmc/Makefile.am
+++ b/bmc/Makefile.am
@@ -6,17 +6,16 @@
 	file_handler.cpp \
 	prepare_systemd.cpp \
 	verify_systemd.cpp \
-	update_systemd.cpp
+	update_systemd.cpp \
+	lpc_handler.cpp
 
-if ENABLE_LPC_BRIDGE
-libfirmwareblob_common_la_SOURCES += lpc_handler.cpp
 if ENABLE_ASPEED_LPC
 libfirmwareblob_common_la_SOURCES += lpc_aspeed.cpp
 endif
+
 if ENABLE_NUVOTON_LPC
 libfirmwareblob_common_la_SOURCES += lpc_nuvoton.cpp
 endif
-endif
 
 if ENABLE_ASPEED_P2A
 libfirmwareblob_common_la_SOURCES += pci_handler.cpp