dt-bindings: ata: add support for Broadcom NSP SoC ahci

Add support for Broadcom NSP SoC ahci
Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

Documentation/devicetree/bindings/ata/brcm,sata-brcm.txt

@@ -7,6 +7,7 @@ Required properties:
 - compatible         : should be one or more of
 			"brcm,bcm7425-ahci"
 			"brcm,bcm7445-ahci"
+			"brcm,bcm-nsp-ahci"
 			"brcm,sata3-ahci"
 - reg                : register mappings for AHCI and SATA_TOP_CTRL
 - reg-names          : "ahci" and "top-ctrl"