soc: bcm: brcmstb: Add missing DDR MEMC compatible strings

We would not be matching the following chip/compatible strings
combinations, which would lead to not setting the warm boot flag
correctly, fix that:

    7260A0/B0: brcm,brcmstb-memc-ddr-rev-b.2.1
    7255A0: brcm,brcmstb-memc-ddr-rev-b.2.3
    7278Bx: brcm,brcmstb-memc-ddr-rev-b.3.1

The B2.1 core (which is in 7260 A0 and B0) doesn't have the
SHIMPHY_ADDR_CNTL_0_DDR_PAD_CNTRL setup in the memsys init code, nor
does it have the warm boot flag re-definition on entry. Those changes
were for B2.2 and later MEMSYS cores. Fall back to the previous S2/S3
entry method for these specific chips.

Fixes: 0b741b8234 ("soc: bcm: brcmstb: Add support for S2/S3/S5 suspend states (ARM)")
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

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

@@ -189,8 +189,11 @@ Power-Down (SRPD), among other things.
 
 Required properties:
 - compatible     : should contain one of these
+	"brcm,brcmstb-memc-ddr-rev-b.2.1"
 	"brcm,brcmstb-memc-ddr-rev-b.2.2"
+	"brcm,brcmstb-memc-ddr-rev-b.2.3"
 	"brcm,brcmstb-memc-ddr-rev-b.3.0"
+	"brcm,brcmstb-memc-ddr-rev-b.3.1"
 	"brcm,brcmstb-memc-ddr"
 - reg            : the MEMC DDR register range
 

drivers/soc/bcm/brcmstb/pm/pm-arm.c

@@ -627,14 +627,26 @@ static const struct of_device_id ddr_shimphy_dt_ids[] = {
 };
 
 static const struct of_device_id brcmstb_memc_of_match[] = {
+	{
+		.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.1",
+		.data = &ddr_seq,
+	},
 	{
 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.2",
 		.data = &ddr_seq_b22,
 	},
+	{
+		.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.3",
+		.data = &ddr_seq_b22,
+	},
 	{
 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.3.0",
 		.data = &ddr_seq_b22,
 	},
+	{
+		.compatible = "brcm,brcmstb-memc-ddr-rev-b.3.1",
+		.data = &ddr_seq_b22,
+	},
 	{
 		.compatible = "brcm,brcmstb-memc-ddr",
 		.data = &ddr_seq,