staging: rtl8192e: Remove unused function _rtl92e_dm_init_wa_broadcom_iot

Remove unused function _rtl92e_dm_init_wa_broadcom_iot and the variables
that are not any longer used.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/0e7a2a5b9edc85b7f8e3fc0f9e0e6ab7f2830d02.1680902603.git.philipp.g.hortmann@gmail.com


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