staging: r8188eu: bHWPwrPindetect is always false

The bHWPwrPindetect component of struct pwrctrl_priv is never initialised
explicitly, it remains at its default value 0.

Remove bHWPwrPindetect itself and code that depends on
bHWPwrPindetect != 0.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210911161019.26881-2-martin@kaiser.cx


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