libpldm: Migrate to subproject

Organize files in libpldm to make it a subproject

In the current state, libpldm is not readily consumable
as a subproject.This commit does all the necessary re-organisation
of the source code to make it work as a subproject.

There are no .c/.h files changes in this commit, only meson
changes and re-organising the code structure.

Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
Change-Id: I20a71c0c972b1fd81fb359d604433618799102c6
diff --git a/libpldm.pc.in b/libpldm.pc.in
new file mode 100644
index 0000000..d6bdcf8
--- /dev/null
+++ b/libpldm.pc.in
@@ -0,0 +1,14 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libpldm
+Description: PLDM encode/decode C library
+URL: https://github.com/openbmc/pldm/libpldm
+Version: @VERSION@
+Requires: @AX_PACKAGE_REQUIRES@
+Requires.private: @AX_PACKAGE_REQUIRES_PRIVATE@
+Libs: -L@libdir@ -lpldm
+Cflags: -I@includedir@
+