staging: r8188eu: remove unused function Hal_ProSetCrystalCap()

Remove unused function Hal_ProSetCrystalCap().

Acked-by: Phillip Potter <phil@philpotter.co.uk>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210907210924.22287-1-straube.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>