arm: mach-k3: Kconfig: Introduce a symbol to indicate J7200

J7200 shares quite a few characteristics with J721E. However a few sets
are different. Introduce a Kconfig to differentiate the two to allow for
new boards to be introduced in a seamless manner.

Signed-off-by: Nishanth Menon <nm@ti.com>
diff --git a/arch/arm/mach-k3/Kconfig b/arch/arm/mach-k3/Kconfig
index c95a419..0389842 100644
--- a/arch/arm/mach-k3/Kconfig
+++ b/arch/arm/mach-k3/Kconfig
@@ -24,6 +24,11 @@
 
 endchoice
 
+if SOC_K3_J721E
+config SOC_K3_J721E_J7200
+	bool "TI's K3 based J7200 SoC variant Family Support"
+endif
+
 config SYS_SOC
 	default "k3"