DO NOT MERGE: dmaengine: apple-admac: Add temporary aop-admac compatible

The ADMAC attached to the AOP has complex power sequencing, and is
power gated when the probe callback runs.
To avoid issues downstream with mixing new devicetree and old kernel use
a new compatible string for aop-admac.
The fix "dmaengine: apple-admac: Avoid accessing registers in probe" is
in the meantime upstreamed so aop-admac can be upstreamed with the the
correct compatible string.

Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
Signed-off-by: Janne Grunau <j@jannau.net>

Author: WhatAmISupposedToPutHere

drivers/dma/apple-admac.c

@@ -936,6 +936,7 @@ static void admac_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id admac_of_match[] = {
+	{ .compatible = "apple,admac2", },
 	{ .compatible = "apple,admac", },
 	{ }
 };