library/PCUIF_Types: fix padding attribute for PCUIF_Message

This fixes tons of warnings like this one:

  dec_PCUIF_Message(): Data remained at the end of the stream
                       after successful decoding: '00'O

Change-Id: If34da75c21b023222c44504d561cd6f658a401cf
Fixes: e0666ea5 "PCUIF: upgrade to PCUIF v12"
Related: OS#6191
1 file changed