i965: perf: update configs for loading from userspace

i965: perf: update configs for loading from userspace

When making configs loadable from userspace in the kernel, we left to
userspace more responsability around programming some registers. In
particular one register we use to set directly in the driver has now
been moved into the configs.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>