Currently handling of kernel_append_params is very inconsistent. This
change applies a straightforward process:
1. instance_info[kernel_append_params]
2. driver_info[kernel_append_params]
3. [$driver]kernel_append_params
The existing ilo_kernel_append_params is declared but never implemented,
so it's removed without deprecation in favor of the new option.
Story: #2008902
Task: #42470
Task: #42471
Change-Id: I0fcd7c63a4bc41110eb7f4cd4031580ef98d9a19
e51404c8e7