gPTP gptp_priority_vector struct field ordering is wrong

[jukkar]

Describe the bug
The field ordering of gptp_priority_vector is wrong. This affects how BMCA (Best Master Clock selection Algorithm) will choose the best clock.
Specifically the steps_removed field must be placed right after root_system_id in the gptp_priority_vector struct.
The struct should look like this:

struct gptp_priority_vector {
	/** Identity of the source clock. */
	struct gptp_root_system_identity root_system_id;

	/** Steps removed from the announce message transmitter and the
	 * master clock. Note that this field must be right after
	 * root_system_id as we are comparing root system id and steps
	 * removed in one memcmp()
	 */
	u16_t steps_removed;

	/** Port identity of the transmitting time-aware system. */
	struct gptp_port_identity src_port_id;

	/** Port number of the receiving port. */
	u16_t port_number;
} __packed;

This issue is already fixed in master but needs to be backported to 1.14.

[jukkar]

Already merged.