ide: Avoid preprocessor for CONFIG_LBA48

Use IS_ENABLED() instead for all conditions. Add the 'lba48' flag into
struct blk_desc always, since it uses very little space. Use a bool so
the meaning is clearer.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>

include/blk.h

@@ -62,10 +62,8 @@ struct blk_desc {
 	unsigned char	hwpart;		/* HW partition, e.g. for eMMC */
 	unsigned char	type;		/* device type */
 	unsigned char	removable;	/* removable device */
-#ifdef CONFIG_LBA48
 	/* device can use 48bit addr (ATA/ATAPI v7) */
-	unsigned char	lba48;
-#endif
+	bool	lba48;
 	unsigned char	atapi;		/* Use ATAPI protocol */
 	lbaint_t	lba;		/* number of blocks */
 	unsigned long	blksz;		/* block size */