Revert "tests/tcg/nios2: Re-enable linux-user tests"

nios2 signal tests are broken again:

retry.py -n 10 -c -- ./qemu-nios2 ./tests/tcg/nios2-linux-user/signals
Results summary:
0: 8 times (8

Revert "tests/tcg/nios2: Re-enable linux-user tests"

nios2 signal tests are broken again:

retry.py -n 10 -c -- ./qemu-nios2 ./tests/tcg/nios2-linux-user/signals
Results summary:
0: 8 times (80.00%), avg time 2.254 (0.00 varience/0.00 deviation)
-11: 2 times (20.00%), avg time 0.253 (0.00 varience/0.00 deviation)
Ran command 10 times, 8 passes

This wasn't picked up by CI as we don't have a docker container that
can build QEMU with the nios2 compiler. I don't have time to bisect
the breakage and the target is orphaned anyway so take the easy route
and revert it.

This reverts commit 20e7524ff9f0cab4c9a0306014d6f3d7b467ae1e.

Cc: Chris Wulff <crwulff@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231106185112.2755262-23-alex.bennee@linaro.org>

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