Implicit padding being added to multiple MM commands

[dmknutsen]

Checklist (Please check before submitting)

• [x ] I reviewed the Contributing Guide.
• [x ] I reviewed the README file to see if the feature is in the major future work.
• [x ] I performed a cursory search to see if the feature request is relevant, not redundant, nor in conflict with other tickets.

Is your feature request related to a problem? Please describe.
Some MM commands assume a 64 bit aligned header while others are offset by 32 bits. An example would be the Peek vs Poke commands.

Requester Info
Dan Knutsen
NASA Goddard

[skliper]

MM/fsw/src/mm_msg.h

Lines 76 to 84 in b0e3c20

	typedef struct
	{
	CFE_MSG_CommandHeader_t CmdHeader; /**< \brief Command header */
	uint8 DataSize; /**< \brief Size of the data to be read */
	uint8 MemType; /**< \brief Memory type to peek data from */
	uint8 Padding[2]; /**< \brief Structure padding */
	MM_SymAddr_t SrcSymAddress; /**< \brief Symbolic source peek address */
	} MM_PeekCmd_t;

MM/fsw/src/mm_msg.h

Lines 91 to 100 in b0e3c20

	typedef struct
	{
	CFE_MSG_CommandHeader_t CmdHeader; /**< \brief Command header */
	uint8 DataSize; /**< \brief Size of the data to be written */
	uint8 MemType; /**< \brief Memory type to poke data to */
	uint8 Padding[2]; /**< \brief Structure padding */
	uint32 Data; /**< \brief Data to be written */
	MM_SymAddr_t DestSymAddress; /**< \brief Symbolic destination poke address */
	} MM_PokeCmd_t;

Padding may or may not get added depending on the alignment requirement of addresses and the alignment of the header.