Kernel selftests: Add check if TPM devices are supported

TPM2 tests set uses /dev/tpm0 and /dev/tpmrm0 without check if they
are available. In case, when these devices are not available test
fails, but expected behaviour is skipped test.
Signed-off-by: Nikita Sobolev <Nikita.Sobolev@synopsys.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/tpm2/test_smoke.sh

 #!/bin/bash
 # SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
+[ -f /dev/tpm0 ] || exit $ksft_skip
+
 python -m unittest -v tpm2_tests.SmokeTest
 python -m unittest -v tpm2_tests.AsyncTest
 

tools/testing/selftests/tpm2/test_space.sh

 #!/bin/bash
 # SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
 
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
+[ -f /dev/tpmrm0 ] || exit $ksft_skip
+
 python -m unittest -v tpm2_tests.SpaceTest