Decode APIs now accept const struct pldm_msg *msg

All the decode_xxx APIs were changed to accept the complete pldm_msg
instead of working with just a specific member (payload) making it
consistent with the encode_xxx APIs.

Following changes were made through out the code,
 - decode_xxx now requires to send the const struct pldm_msg *msg
   instead of a const uint8_t *msg.
 - Within the decode_xxx function the payload is extracted and used
   accordingly.
 - All the calls made to decode_xxx APIs have been modified to now
   pass the pointer to pldm_msg_hdr (struct pldm_msg *msg).
 - The test code was modified to now pass the appropriate data
   to all the encode_xxx APIs.

Change-Id: I16a3f6e554ea2c9fa44d55dc8f21f65022bd983a
Signed-off-by: Zahed Hossain <zahzahed@in.ibm.com>