arm64: dts: ti: k3-am64-main: Update TF-A's maximum size and node name

The maximum size of TF-A 2.5 has been increased to 0x1c000 [1]. In order to
account for future expansions too, increase the allocated size for TF-A to
0x20000, in the device tree node.

Also, update the node name to "tfa-sram".

[1] - https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/commit/?id=2fb5312f61a7de8b7a70e1639199c4f14a10b6f9Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Reviewed-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20210616171224.24635-2-a-govindraju@ti.com

arch/arm64/boot/dts/ti/k3-am64-main.dtsi

@@ -24,8 +24,8 @@ oc_sram: sram@70000000 {
 		#size-cells = <1>;
 		ranges = <0x0 0x00 0x70000000 0x200000>;
 
-		atf-sram@0 {
-			reg = <0x0 0x1a000>;
+		tfa-sram@0 {
+			reg = <0x0 0x20000>;
 		};
 	};