libpldmresponder: implement handler for GetPDR

This commit implements the GetPDR command as defined in DSP0248 v1.1.1.
Multipart PDR transfers are still not implemented.

Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
Change-Id: Ic520a914e8228b723521151f4ba1eed947179047
diff --git a/libpldmresponder/meson.build b/libpldmresponder/meson.build
index c63685c..45dff73 100644
--- a/libpldmresponder/meson.build
+++ b/libpldmresponder/meson.build
@@ -13,6 +13,7 @@
   'pdr.cpp',
   'effecters.cpp',
   'utils.cpp',
+  'platform.cpp',
   '../registration.cpp'
 ]