staging: r8188eu: ROMVer is always zero

The variable ROMVer in struct HAL_VERSION is set to zero and never
changed. Remove it and replace its use with zero.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220407192819.10661-4-straube.linux@gmail.com


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