selftest: tc-testing: remove tc-testing case (torvalds#290)

The tc-testing selftest suite is compiled using Clang, which is not supported in
the current glibc toolchain. When building the test suite, Buildroot attempts
to use the host x86 Clang, resulting in architecture mismatches and build failures.
To avoid this, the test case is removed.

Signed-off-by: Cynthia Huang <cynthia@andestech.com>

Reviewed-on: https://gitea.andestech.com/RD-SW/linux/pulls/290
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
Reviewed-by: Mina Hui-Min Chou <minachou@andestech.com>
Co-authored-by: Cynthia Huang <cynthia@andestech.com>
Co-committed-by: Cynthia Huang <cynthia@andestech.com>

Author: cynthia0928

tools/testing/selftests/Makefile

@@ -83,7 +83,6 @@ TARGETS += static_keys
 TARGETS += sync
 TARGETS += syscall_user_dispatch
 TARGETS += sysctl
-TARGETS += tc-testing
 TARGETS += tdx
 TARGETS += timens
 ifneq (1, $(quicktest))