ShellPkg: Correctly support "map -c"
When “map –c” is run, the mapped items should be displayed with the consistent name as the one listed to the left and all other names listed as “alias(s)”

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Chris Phillips <chrisp@hp.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14881 6f19259b-4bc3-4df7-8a09-765794883524