clang-format: UseTab use ForContinuationAndIndentation

Modify UseTab to use ForContinuationAndIndentation instead
of always. This will only use tabs for indentation, and then
spaces for alignment, which is the most commonly used approach
in Zephyr.

Signed-off-by: Emil Gydesen <[email protected]>

Author: Thalley

.clang-format

@@ -83,7 +83,7 @@ IndentWidth: 8
 InsertBraces: true
 SpaceBeforeParens: ControlStatementsExceptControlMacros
 SortIncludes: Never
-UseTab: Always
+UseTab: ForContinuationAndIndentation
 WhitespaceSensitiveMacros:
   - STRINGIFY
   - Z_STRINGIFY