spi: sh-msiof: Do not use C++ style comment

4286db8456f4 ("spi: sh-msiof: Add R-Car Gen 2 and 3 fallback bindings")
added a C++ style comment. This is not in keeping with the style used
for comments elsewhere in this fine. Update it accordingly.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-sh-msiof.c

@@ -982,7 +982,7 @@ static const struct of_device_id sh_msiof_match[] = {
 	{ .compatible = "renesas,rcar-gen2-msiof", .data = &r8a779x_data },
 	{ .compatible = "renesas,msiof-r8a7796",   .data = &r8a779x_data },
 	{ .compatible = "renesas,rcar-gen3-msiof", .data = &r8a779x_data },
-	{ .compatible = "renesas,sh-msiof",        .data = &sh_data }, // Deprecated
+	{ .compatible = "renesas,sh-msiof",        .data = &sh_data }, /* Deprecated */
 	{},
 };
 MODULE_DEVICE_TABLE(of, sh_msiof_match);