BeagleBoardPkg: add missing BootLogoLib resolution

Recent changes to the PlatformBootManagerLib implementation in ArmPkg
require its users to define a resolution for BootLogoLib. So add this
missing resolution to Beagle.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>