Remove MCP750 specific ATA device mapping

[skliper]

Is your feature request related to a problem? Please describe.
This code is out of OSAL scope:

osal/src/os/vxworks/src/os-impl-filesys.c

Lines 115 to 128 in ead5723

	#ifdef USE_VXWORKS_ATA_DRIVER
	case OS_FILESYS_TYPE_NORMAL_DISK:
	{
	/*
	** Create the Flash disk device
	** This code requires an ATA driver in the BSP, so it must be
	** left out of the compilation BSPs without.
	*/
	OS_DEBUG("OSAL: Starting an ATA DISK: %s\n", local->volume_name);
	impl->xbdMaxPartitions = 4;
	impl->blkDev = ataDevCreate(0, 0, 0, 0);
	break;
	}
	#endif

Describe the solution you'd like
Move to PSP or similar.

Describe alternatives you've considered
Leave as-is (future work)

Additional context
None

Requester Info
Jacob Hageman - NASA/GSFC, OSAL code review