EmulatorPkg: Remove EdkShellBinPkg in FDF and DEC

EmulatorPkg: Remove EdkShellBinPkg in FDF and DEC

Remove EdkShellBinPkg in EmulatorPkg.dec and
EmulatorPkg.fdf.
https://bugzilla.tianocore.org/show_bug.cgi?id=1108

v2: Remove USE_OLD_SHELL because it will not be used.

v4: Remove PcdShellFile in EmulatorPkg.dsc.
https://bugzilla.tianocore.org/show_bug.cgi?id=1298

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Andrew Fish <afish@apple.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>