ArmVirtualizationPkg: identify "new shell" as builtin shell for Intel BDS

The default value of this PCD (in "IntelFrameworkModulePkg.dec")
identifies the "old shell" from EdkShellBinPkg. Our build includes the
"new" shell from ShellBinPkg/UefiShell/UefiShell.inf; let's specify the
FILE_GUID of that.

Otherwise, no boot option will be generated for the Shell application.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Olivier Martin <Olivier.martin@arm.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16577 6f19259b-4bc3-4df7-8a09-765794883524