Rename IBM OEM state set header and install it

If external code needs to use the IBM OEM state sets, then the header
defining those needs to be installed in the library. So, rename it to
avoid conflicts with the regular state sets header and tell meson to
install it.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Change-Id: Icadfa35524fe0d2a5b6b071d85c18f70060127e3
diff --git a/libpldm/meson.build b/libpldm/meson.build
index 0d868f9..edd0727 100644
--- a/libpldm/meson.build
+++ b/libpldm/meson.build
@@ -30,7 +30,8 @@
   headers += [
     '../oem/ibm/libpldm/file_io.h',
     '../oem/ibm/libpldm/host.h',
-    '../oem/ibm/libpldm/platform_oem_ibm.h'
+    '../oem/ibm/libpldm/platform_oem_ibm.h',
+    '../oem/ibm/libpldm/state_set_oem_ibm.h'
   ]
   sources += [
     '../oem/ibm/libpldm/file_io.c',