ixgbe: Clean up interface for firmware commands

ixgbe: Clean up interface for firmware commands

Orabug: 23177316

Clean up the interface for issuing firmware commands to use a
void * instead of a u32 *. This eliminates a number of casts.
Also clean up ixgbe_host_interface_command in a few other ways,
eliminating comparisons with 0, redundant parens and minor
formatting issues.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit 5cffde309cb3f6f7aaaa459abd3eba245a863f8a)
Signed-off-by: Brian Maly <brian.maly@oracle.com>