drm/i915/guc: Check sizing of guc_capture output

Add intel_guc_capture_output_min_size_est function to
provide a reasonable minimum size for error-capture
region before allocating the shared buffer.

Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220321164527.2500062-10-alan.previn.teres.alexis@intel.com