red pitaya actiontable_t padding

typedef struct actionTable {
	uint64_t nanos; // ulong max 4.9secs, ull max = 584 years
  XTime clocks;
	uint32_t pins;
  uint32_t a1;
  uint32_t a2;
} actionTable_t;

(XTime = u64)
niave assumption: that this is of size 8 + 8 + 4 + 4 + 4 = 28

sizeof(actionTable_t) = 32
allignment I guess?

reqs: struct is alligend to muiltiple of its largest member - 8 bytes. pad[4] on the end?

## pahole confirmed:

struct actionTable {
	uint64_t                   nanos;                /*     0     8 */
	XTime                      clocks;               /*     8     8 */
	uint32_t                   pins;                 /*    16     4 */
	uint32_t                   a1;                   /*    20     4 */
	uint32_t                   a2;                   /*    24     4 */

	/* size: 32, cachelines: 1, members: 5 */
	/* padding: 4 */
	/* last cacheline: 32 bytes */
};