arm64: dts: ti: Makefile: Use ARCH_K3 for building dtbs

To allow lesser dependency and better maintainability use CONFIG_ARCH_K3
for building dtbs for all K3 based devices. This is as per the
discussion in [0].

[0] https://lore.kernel.org/linux-arm-kernel/20200908112534.t5bgrjf7y3a6l2ss@akan/Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Suman Anna <s-anna@ti.com>
Link: https://lore.kernel.org/r/20200914162231.2535-2-lokeshvutla@ti.com

arch/arm64/boot/dts/ti/Makefile

@@ -3,9 +3,9 @@
 # Make file to build device tree binaries for boards based on
 # Texas Instruments Inc processors
 #
-# Copyright (C) 2016-2018 Texas Instruments Incorporated - https://www.ti.com/
+# Copyright (C) 2016-2020 Texas Instruments Incorporated - https://www.ti.com/
 #
 
-dtb-$(CONFIG_ARCH_K3_AM6_SOC) += k3-am654-base-board.dtb
+dtb-$(CONFIG_ARCH_K3) += k3-am654-base-board.dtb
 
-dtb-$(CONFIG_ARCH_K3_J721E_SOC) += k3-j721e-common-proc-board.dtb
+dtb-$(CONFIG_ARCH_K3) += k3-j721e-common-proc-board.dtb