David Brownell <david-b@pacbell.net> Cleanup the Stellaris target configs:

 - remove endianness options; these chips hard-wire "little"
 - $_TARGETNAME updates:
    * don't pass $_TARGETNAME where a TAP label is required
    * flash config uses $_TARGETNAME (it might not be target #0)
    * simplify one $_TARGETNAME construction
 - update work area setup:
    * remove VM spec; these chips have no VM!
    * fix some wrong sizes (0x4000 == 16K, not 4K)
    * simplify: take defaults
 - comment fixups


git-svn-id: svn://svn.berlios.de/openocd/trunk@2589 b42882b7-edfa-0310-969c-e2dbd0fdcd60