staging: r8188eu: remove pm_netdev_open

The only caller of pm_netdev_open sets bnormal to true. In this case,
pm_netdev_open just calls netdev_open.

Remove pm_netdev_open and call netdev_open directly.

Reviewed-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211126130400.26151-2-martin@kaiser.cx


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