SOC15 chips require a reset if the driver was previously loaded
because the PSP can only be loaded once between each reset.

v2: rebase, handle multiple asic funcs
Reviewed-by: NEvan Quan <evan.quan@amd.com>
Reviewed-by: NFelix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>