spi: Fix flag collision for SST_WP

At present SECT_4K is the same as SST_WP so we cannot tell these apart. Fix
this so that the table in sf_params.c can be used correctly.

Reported-by: Jens Rottmann <Jens.Rottmann@adlinktech.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>

drivers/mtd/spi/sf_internal.h

@@ -41,6 +41,7 @@ enum {
 	SECT_32K	= 1 << 1,
 	E_FSR		= 1 << 2,
 	WR_QPP		= 1 << 3,
+	SST_WP		= 1 << 4,
 };
 
 #define SPI_FLASH_3B_ADDR_LEN		3
@@ -104,7 +105,6 @@ enum {
 
 /* SST specific */
 #ifdef CONFIG_SPI_FLASH_SST
-# define SST_WP		0x01	/* Supports AAI word program */
 # define CMD_SST_BP		0x02    /* Byte Program */
 # define CMD_SST_AAI_WP	0xAD	/* Auto Address Incr Word Program */