ARM: dts: keystone: update for supporting K2L/K2E EVMs

This patch add compatibility strings for k2hk, k2l and k2e EVMs

Cc: Olof Johansson <olof@lixom.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

Documentation/devicetree/bindings/arm/keystone/keystone.txt

@@ -8,3 +8,13 @@ Required properties:
  - compatible: All TI specific devices present in Keystone SOC should be in
    the form "ti,keystone-*". Generic devices like gic, arch_timers, ns16550
    type UART should use the specified compatible for those devices.
+
+Boards:
+-  Keystone 2 Hawking/Kepler EVM
+   compatible = "ti,k2hk-evm"
+
+-  Keystone 2 Lamarr EVM
+   compatible = "ti,k2l-evm"
+
+-  Keystone 2 Edison EVM
+   compatible = "ti,k2e-evm"

arch/arm/mach-keystone/keystone.c

@@ -47,6 +47,9 @@ static void __init keystone_init(void)
 
 static const char *keystone_match[] __initconst = {
 	"ti,keystone-evm",
+	"ti,k2hk-evm",
+	"ti,k2l-evm",
+	"ti,k2e-evm",
 	NULL,
 };