ARM: at91: pm: use SAM9X60 PMC's compatible

SAM9X60 PMC's has a different PMC. It was not integrated at the moment
commit 01c7031c ("ARM: at91: pm: initial PM support for SAM9X60")
was published.

Fixes: 01c7031c ("ARM: at91: pm: initial PM support for SAM9X60")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/1576062248-18514-2-git-send-email-claudiu.beznea@microchip.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

arch/arm/mach-at91/pm.c

@@ -751,6 +751,7 @@ static const struct of_device_id atmel_pmc_ids[] __initconst = {
 	{ .compatible = "atmel,sama5d3-pmc", .data = &pmc_infos[1] },
 	{ .compatible = "atmel,sama5d4-pmc", .data = &pmc_infos[1] },
 	{ .compatible = "atmel,sama5d2-pmc", .data = &pmc_infos[1] },
+	{ .compatible = "microchip,sam9x60-pmc", .data = &pmc_infos[1] },
 	{ /* sentinel */ },
 };