EmulatorPkg: Record Argc, Argv and Envp in EmuThunk Ppi

EmulatorPkg: Record Argc, Argv and Envp in EmuThunk Ppi

Record Argc, Argv and Envp in EmuThunk Ppi so that other modules
can use these fields to change behavior depends on boot parameters
or environment.

Cc: Andrew Fish <afish@apple.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>