ARM: brcmstb: add CPU binding for Broadcom Brahma15

Add the Broadcom Brahma B15 CPU to the DT CPU binding list.
Signed-off-by: NMarc Carino <marc.ceeeee@gmail.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Signed-off-by: NMatt Porter <mporter@linaro.org>

Documentation/devicetree/bindings/arm/cpus.txt

@@ -163,6 +163,7 @@ nodes to be present and contain the properties described below.
 			    "arm,cortex-r4"
 			    "arm,cortex-r5"
 			    "arm,cortex-r7"
+			    "brcm,brahma-b15"
 			    "faraday,fa526"
 			    "intel,sa110"
 			    "intel,sa1100"
@@ -184,6 +185,7 @@ nodes to be present and contain the properties described below.
 			  can be one of:
 			    "allwinner,sun6i-a31"
 			    "arm,psci"
+			    "brcm,brahma-b15"
 			    "marvell,armada-375-smp"
 			    "marvell,armada-380-smp"
 			    "marvell,armada-xp-smp"