staging: r8188eu: simplify rtl8188e_HalDmWatchDog

Now that we don't call dm_CheckStatistics any more, we don't need
fw_cur_in_ps and fw_ps_awake.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211011201159.10252-3-martin@kaiser.cx


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