sys: util_macro: Add IF_DISABLED

#define IF_ENABLED(_flag, _code) \

	COND_CODE_1(_flag, _code, ())

/**

 * @brief Insert code if @p _flag is not defined as 1.

 *

 * This expands to nothing if @p _flag is defined and equal to 1;

 * it expands to @p _code otherwise.

 *

 * Example:

 *

 *     IF_DISABLED(CONFIG_FLAG, (uint32_t foo;))

 *

 * If @p CONFIG_FLAG isn't defined or different than 1, this expands to:

 *

 *     uint32_t foo;

 *

 * and to nothing otherwise.

 *

 * IF_DISABLED does the opposite of IF_ENABLED.

 *

 * @param _flag evaluated flag

 * @param _code result if @p _flag does not expand to 1; must be in parentheses

 */

#define IF_DISABLED(_flag, _code) \

	COND_CODE_1(_flag, (), _code)

/**

 * @brief Check if a macro has a replacement expression

 *