dt-bindings: ARM: brcmstb: Update Broadcom STB Power Management binding

Update the Broadcom STB Power Management binding document with new
compatible strings for the DDR PHY and memory controller found on newer
chips.
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>

Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt

@@ -164,6 +164,8 @@ Control registers for this memory controller's DDR PHY.
 
 Required properties:
 - compatible     : should contain one of these
+	"brcm,brcmstb-ddr-phy-v71.1"
+	"brcm,brcmstb-ddr-phy-v72.0"
 	"brcm,brcmstb-ddr-phy-v225.1"
 	"brcm,brcmstb-ddr-phy-v240.1"
 	"brcm,brcmstb-ddr-phy-v240.2"
@@ -184,7 +186,9 @@ Sequencer DRAM parameters and control registers. Used for Self-Refresh
 Power-Down (SRPD), among other things.
 
 Required properties:
-- compatible     : should contain "brcm,brcmstb-memc-ddr"
+- compatible     : should contain one of these
+	"brcm,brcmstb-memc-ddr-rev-b.2.2"
+	"brcm,brcmstb-memc-ddr"
 - reg            : the MEMC DDR register range
 
 Example: