ShellPkg: Refine the code to reduce time cost of 'map -r'

ShellPkg: Refine the code to reduce time cost of 'map -r'

In some platform 'map -r' may cost more than 1 min. This patch filter the target handles by
BlockIO and SimpleFileSystem protocol to reduce the time cost.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19149 6f19259b-4bc3-4df7-8a09-765794883524