Add .cache to gitignore

Change-Id: Ida03bf1f50704bea44827d7578cd74c1896d4368
Signed-off-by: Galantsev, Dmitrii <dmitrii.galantsev@amd.com>

.gitignore

@@ -12,3 +12,6 @@ python_smi_tools/rsmiBindings.py
 
 # Build directory
 build/
+
+# CMake cache
+.cache/