i915 expects GuC log level to be specified as:
	0: disabled
	1: enabled (verbosity level 0 = min)
	2: enabled (verbosity level 1)
	3: enabled (verbosity level 2)
	4: enabled (verbosity level 3 = max)

Remove the earlier internal layout based logging control from
guc_log_control and send new expected values.

v2: log_level assert in guc_log_control, cleaner level setup (Michal)
added missing copyright header. (Sagar)

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michal Winiarski <michal.winiarski@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>