i40iw: fix build warning in i40iw_manage_apbvt()

Not upstream as this function is no longer around anymore.

The function i40iw_manage_apbvt() has the wrong prototype match from the
.h file to the .c declaration, so fix it up, otherwise gcc-13 complains
(rightfully) that the type is incorrect.

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