staging: rtl8188eu: remove unused power flows and transitions

The driver defines a couple of "flows" to move the chip into a certain
power state. Each flow is a sequence of "transitions".

This patch removes flows and transitions which are not used.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20210718173610.894-7-martin@kaiser.cx


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