staging: rtl8192e: Rename state to link_state

Rename state to link_state to align with rtlwifi driver and to
increase readability as state is to general.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/9cf4d0b01c6a84a11939099b628754d4c6d54839.1687007788.git.philipp.g.hortmann@gmail.com


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