i40e/base: remove useless assignments

i40e/base: remove useless assignments

The assignments of addr_high and addr_low were not only wrong because
they were assigning virtual addresses to a hardware accessed variable,
but they were shortly thereafter overwritten by the send_asq_command
call with a non-NULL third argument (buffer) with correctly formatted
data.

Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
Acked-by: Helin Zhang <helin.zhang@intel.com>
Tested-by: Huilong Xu <huilongx.xu@intel.com>