fix: ff.h中MIN MAX宏定义不符合常规用法且存在重定义冲突风险

close: #I5OYYA
Signed-off-by: Narvinzzz <zhaotianyu9@huawei.com>
Change-Id: Ibff61316dacd2d685471def2350ca97768ed322c

source/ff.h

@@ -374,9 +374,6 @@ typedef struct {
 #endif
 } DIR_FILE;
 
-#define MAX(a, b, c)	(c = (a > b) ? a : b)
-#define MIN(a, b, c)	(c = (a < b) ? a : b)
-
 /* File function return code (FRESULT) */
 
 typedef enum {