xmc/tests: Update .gitignore to exclude untracked files.

Signed-off-by: Frederikwag <frederik.wagner@infineon.com>

Author: Frederikwag

.gitignore

@@ -26,4 +26,9 @@ err.xml
 docs/build
 docs/source/_build
 __pycache__/
-_build/
+_build/
+
+echo "libraries/SPI/src/SPI.cpp" >> .gitignore
+echo "set_all_pins_input.ino" >> .gitignore
+echo "src/" >> .gitignore
+echo "tests/minimal_test.ino" >> .gitignore