ram: k3-ddrss: Add support for J721S2 SoC

Add support for DDR subsystem in J721S2 SoC.

Signed-off-by: David Huang <d-huang@ti.com>
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
diff --git a/drivers/ram/Kconfig b/drivers/ram/Kconfig
index a79594d..709c916 100644
--- a/drivers/ram/Kconfig
+++ b/drivers/ram/Kconfig
@@ -62,7 +62,7 @@
 	depends on K3_DDRSS
 	prompt "K3 DDRSS Arch Support"
 
-	default K3_J721E_DDRSS if SOC_K3_J721E
+	default K3_J721E_DDRSS if SOC_K3_J721E || SOC_K3_J721S2
 	default K3_AM64_DDRSS if SOC_K3_AM642
 
 config K3_J721E_DDRSS