`CFE_PSP_TIMER_LOW32_ROLLOVER` defined but not used in vxworks timebase implementation

[skliper]

Is your feature request related to a problem? Please describe.
Defined here:

PSP/fsw/modules/timebase_vxworks/cfe_psp_timebase_vxworks.c

Lines 55 to 62 in 4bf1eef

	/**
	* \brief The number that the least significant 32 bits of the 64 bit
	* time stamp returned by CFE_PSP_Get_Timebase rolls over. If the lower 32
	* bits rolls at 1 second, then the CFE_PSP_TIMER_LOW32_ROLLOVER will be 1000000.
	* if the lower 32 bits rolls at its maximum value (2^32) then
	* CFE_PSP_TIMER_LOW32_ROLLOVER will be 0.
	*/
	#define CFE_PSP_TIMER_LOW32_ROLLOVER 0

Expected use here:

PSP/fsw/modules/timebase_vxworks/cfe_psp_timebase_vxworks.c

Lines 166 to 185 in 4bf1eef

	/******************************************************************************
	** Function: CFE_PSP_GetTimerLow32Rollover()
	**
	** Purpose:
	** Provides the number that the least significant 32 bits of the 64 bit
	** time stamp returned by CFE_PSP_Get_Timebase rolls over. If the lower 32
	** bits rolls at 1 second, then the CFE_PSP_TIMER_LOW32_ROLLOVER will be 1000000.
	** if the lower 32 bits rolls at its maximum value (2^32) then
	** CFE_PSP_TIMER_LOW32_ROLLOVER will be 0.
	**
	** Arguments:
	**
	** Return:
	** The number that the least significant 32 bits of the 64 bit time stamp
	** returned by CFE_PSP_Get_Timebase rolls over.
	*/
	uint32 CFE_PSP_GetTimerLow32Rollover(void)
	{
	return 0;
	}

Describe the solution you'd like
Use the define or delete it. Note it's defined as 0 and the function returns 0 so behavior wouldn't change.

Describe alternatives you've considered
None.

Additional context
None

Requester Info
Jacob Hageman - NASA/GSFC

Ping @superolmo