Add riscv64 to the list of uapi architectures.

Signed-off-by: Mao Han <han_mao@linux.alibaba.com>
Signed-off-by: Xia Lifang <lifang_xia@linux.alibaba.com>
Signed-off-by: Chen Guoyin <chenguoyin.cgy@linux.alibaba.com>
Signed-off-by: Wang Chen <wangchen20@iscas.ac.cn>
Signed-off-by: Lu Xufan <luxufan@iscas.ac.cn>
Test: bionic/libc/kernel/tools/generate_uapi_headers.sh
Change-Id: I926e1ceaab78b1bb9ae00cf39eb14005aae38e48
diff --git a/libc/kernel/tools/generate_uapi_headers.sh b/libc/kernel/tools/generate_uapi_headers.sh
index 7e49cde..12f60e5 100755
--- a/libc/kernel/tools/generate_uapi_headers.sh
+++ b/libc/kernel/tools/generate_uapi_headers.sh
@@ -43,7 +43,7 @@
 ANDROID_KERNEL_BRANCH="android-mainline"
 KERNEL_DIR=""
 KERNEL_DOWNLOAD=0
-ARCH_LIST=("arm" "arm64" "x86")
+ARCH_LIST=("arm" "arm64" "riscv" "x86")
 ANDROID_KERNEL_DIR="external/kernel-headers/original"
 SKIP_GENERATION=0
 VERIFY_HEADERS_ONLY=0