soc/riscv: fix Kconfig [1/1]

PD#SWPL-61292

Problem:
should not use $ARCH

Solution:
fix Kconfig

Verify:
ad409_a113l

Signed-off-by: kelvin.zhang <kelvin.zhang@amlogic.com>
Change-Id: I724f392dd81cb7d0d59e58099ea2a355872add01
diff --git a/Kconfig b/Kconfig
index 0bf0c96..394facd 100644
--- a/Kconfig
+++ b/Kconfig
@@ -12,4 +12,4 @@
 	  This option holds the directory name used by the build system to locate
 	  the correct linker and header files.
 
-source "soc/$(ARCH)/t5d/Kconfig"
+source "soc/riscv/t5d/Kconfig"