tests: skip thrd test for now

This test fails sporadically on my platforms and block SDK pre-release.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

Author: nashif

tests/lib/c_lib/thrd/testcase.yaml

@@ -30,8 +30,6 @@ tests:
   libraries.libc.c11_threads.picolibc.module:
     filter: CONFIG_ZEPHYR_PICOLIBC_MODULE
     tags: picolibc
-    platform_exclude:
-      - qemu_x86_64/atom
     extra_configs:
       - CONFIG_PICOLIBC=y
       - CONFIG_PICOLIBC_USE_MODULE=y