RISC-V: Enable module support in defconfig

Signed-off-by: Zong Li <zong@andestech.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig
index 47dacf0..bca0eee 100644
--- a/arch/riscv/configs/defconfig
+++ b/arch/riscv/configs/defconfig
@@ -73,3 +73,5 @@
 CONFIG_ROOT_NFS=y
 # CONFIG_RCU_TRACE is not set
 CONFIG_CRYPTO_USER_API_HASH=y
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y