fatfs: add support for variable sector size

components/fatfs/src/ffconf.h

@@ -179,7 +179,7 @@
 
 
 #define	_MIN_SS		512
-#define	_MAX_SS		512
+#define	_MAX_SS		4096
 /* These options configure the range of sector size to be supported. (512, 1024,
 /  2048 or 4096) Always set both 512 for most systems, all type of memory cards and
 /  harddisk. But a larger value may be required for on-board flash memory and some