selftests: tpm2: install python files

Both test_smoke.sh and test_space.sh require tpm2.py and tpm2_test.py.

Rework so that tpm2.py and tpm2_test.py gets installed, added them to
the variable TEST_PROGS_EXTENDED.
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/tpm2/Makefile

@@ -2,3 +2,4 @@
 include ../lib.mk
 
 TEST_PROGS := test_smoke.sh test_space.sh
+TEST_PROGS_EXTENDED := tpm2.py tpm2_tests.py