mtd: cfi: Zap CFI_FLASH_SHIFT_WIDTH redefinition

This is defined twice in the same file, with the same value, likely
because of some patch merge issue. Pick the uglier one and nuke it.
Signed-off-by: NMarek Vasut <marek.vasut+renesas@gmail.com>
Cc: Tom Rini <trini@konsulko.com>
Signed-off-by: NStefan Roese <sr@denx.de>

include/flash.h

@@ -67,8 +67,6 @@ typedef unsigned long flash_sect_t;
 #define FLASH_CFI_BY16		0x02
 #define FLASH_CFI_BY32		0x04
 #define FLASH_CFI_BY64		0x08
-/* convert between bit value and numeric value */
-#define CFI_FLASH_SHIFT_WIDTH	3
 /*
  * Values for the flash device interface
  */