ShellPkg: Add DXE_DRIVER class type to some libraries

ShellPkg: Add DXE_DRIVER class type to some libraries

Shell Libraries can now be used from Platform Drivers with the
introduction of the Shell Dynamic Command Protocol.
Adding DXE_DRIVER class allows to use these libraries with this
class of driver.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Harry Liebel <Harry.Liebel@arm.com>
Reviewed-by: Olivier Martin <olivier.martin@arm.com>
Reviewed-by: Jaben Carsey <Jaben.Carsey@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16052 6f19259b-4bc3-4df7-8a09-765794883524