kselftest/arm64: Always run signals tests with GCS enabled

Since it is not possible to return from the function that enabled GCS
without disabling GCS it is very inconvenient to use the signal handling
tests to cover GCS when GCS is not enabled by the toolchain and runtime,
something that no current distribution does. Since none of the testcases
do anything with stacks that would cause problems with GCS we can sidestep
this issue by unconditionally enabling GCS on startup and exiting with a
call to exit() rather than a return from main().

Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20241001-arm64-gcs-v13-33-222b78d87eee@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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