libcamera: software_isp: Add a clarification comment to AWB

The computed AWB gains are applied when constructing LUT tables rather
than in awb.cpp itself.  This can look confusing when reading awb.cpp,
let's add a clarifying comment.

Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/ipa/simple/algorithms/awb.cpp

@@ -40,6 +40,7 @@ void Awb::prepare(IPAContext &context,
 		  [[maybe_unused]] DebayerParams *params)
 {
 	auto &gains = context.activeState.awb.gains;
+	/* Just report, the gains are applied in LUT algorithm. */
 	frameContext.gains.red = gains.r();
 	frameContext.gains.blue = gains.b();
 }