[top] X-ref ast_sys_clk_jitter testpoint
[top] X-ref ast_sys_clk_jitter testpoint

- The ast_sys_clk_jitter testpoint is already covered
  by chip_sw_clkmgr_jitter, x-ref the two instead of
  adding more tests.

Signed-off-by: Timothy Chen <d7b2ae30d8c0f215facd721941273067fd1d14a2@google.com>

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