staging: r8188eu: remove DynamicTxHighPowerLvl from struct dm_priv

The field DynamicTxHighPowerLvl of struct dm_priv is set but never
used. Remove it and remove now unused variables from
odm_DynamicTxPowerInit().

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210921194658.10654-8-straube.linux@gmail.com


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