[ci] Exclude non-JTAG tests in experimental job
[ci] Exclude non-JTAG tests in experimental job

The job for running experimental JTAG tests was accidentally pulling in
more tests than intended. The semantics of --test_tag_filters are
logical OR for positive tags and logical AND for negative tags. As a
result, "cw310_rom,jtag" selected any tests tagged "cw310_rom" OR
"jtag".

This commit drops the "cw310_rom" requirement so we only select "jtag"
tests. Longer term, we could make run-fpga-cw310-tests.sh's interface
more expressive.

Signed-off-by: Dan McArdle <8fb240f11ec935676fcfd8aed04f42f9ee63efa8@google.com>

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