Revert ibmvnic merge do_change_param_reset into do_reset

This reverts commit 16b5f5ce


where it restructures do_reset. There are patches being tested that
would require major rework if this is committed first.

We will resend this after the other patches have been applied.

Signed-off-by: Dany Madden <drt@linux.ibm.com>
Link: https://lore.kernel.org/r/20201106191745.1679846-1-drt@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>