ShellPkg: Create a homefilesystem environment variable

Create a homefilesystem environment variable whose value is the file
system on which the executing shell is located. For example: "FS14:".

This eliminates the need for people to have to try and find the "boot"
file system in their startup script.  After this change they can simply
execute %homefilesystem% to set the cwd to the root of the file system
where the shell is located.

A future enhancement could be to add "homefilesystem" to the list of
predefined, read-only variables listed in the EfiShellSetEnv function of
file ShellProtocol.c

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jim Dailey <jim_dailey@dell.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

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