move implementation to ipmi file

Move the entrance point for the IPMI OEM handling to a separate file and
pass in the handler pointer via binding.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I4371ebee1c252ab6e9d8a7ff2389583919ecc996
diff --git a/Makefile.am b/Makefile.am
index 59adc1d..43f65aa 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -48,7 +48,8 @@
 	pcie_i2c.cpp \
 	entity_name.cpp \
 	handler.cpp \
-	util.cpp
+	util.cpp \
+	ipmi.cpp
 libsyscmds_common_la_CXXFLAGS = \
 	$(SDBUSPLUS_CFLAGS) \
 	$(PHOSPHOR_LOGGING_CFLAGS) \