pinctrl: aspeed: Document existence of deprecated compatibles

Otherwise they look odd in the face of not being listed in the bindings
documents.
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Link: https://lore.kernel.org/r/20190724081313.12934-3-andrew@aj.id.auSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/aspeed/pinctrl-aspeed-g4.c

@@ -2660,6 +2660,10 @@ static int aspeed_g4_pinctrl_probe(struct platform_device *pdev)
 
 static const struct of_device_id aspeed_g4_pinctrl_of_match[] = {
 	{ .compatible = "aspeed,ast2400-pinctrl", },
+	/*
+	 * The aspeed,g4-pinctrl compatible has been removed the from the
+	 * bindings, but keep the match in case of old devicetrees.
+	 */
 	{ .compatible = "aspeed,g4-pinctrl", },
 	{ },
 };

drivers/pinctrl/aspeed/pinctrl-aspeed-g5.c

@@ -2783,6 +2783,10 @@ static int aspeed_g5_pinctrl_probe(struct platform_device *pdev)
 
 static const struct of_device_id aspeed_g5_pinctrl_of_match[] = {
 	{ .compatible = "aspeed,ast2500-pinctrl", },
+	/*
+	 * The aspeed,g5-pinctrl compatible has been removed the from the
+	 * bindings, but keep the match in case of old devicetrees.
+	 */
 	{ .compatible = "aspeed,g5-pinctrl", },
 	{ },
 };