ShellPkg: Fixes and updates for the 'devices' command

ShellPkg: Fixes and updates for the 'devices' command
- Update 'devices -sfo' format to match UEFI Shell 2.1 spec
- Update help output for easier viewing
- Update 'devices' output format for better alignment when there are many device handles:
     T   D
     Y C I
     P F A
CTRL E G G #P #D #C  Device Name
==== = = = == == === =========================================================

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chris Phillips <chrisp@hp.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15884 6f19259b-4bc3-4df7-8a09-765794883524