sf: Make 4K sector support configurable

Make the support for 4K subpage I/O on a SPI NOR flash configurable.
A board which requires the SPI NOR to be accessed in larger 32KiB
or 64KiB pages can disable the 4K subpage support, but by default,
the support for 4K subpage I/O is enabled. The functionality of this
option is the same as CONFIG_MTD_SPI_NOR_USE_4K_SECTORS in Linux.

This is extremely useful in case one uses UBI on a SPI NOR flash.
UBI needs at least 15k EBs and can not work on a flash which uses
4k ones, so disabling the support for 4k subpages lets UBI work on
such flash.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Jagan Teki <jteki@openedev.com>
diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h
index 9fb5557..9c95d56 100644
--- a/drivers/mtd/spi/sf_internal.h
+++ b/drivers/mtd/spi/sf_internal.h
@@ -37,7 +37,11 @@
 
 /* sf param flags */
 enum {
+#ifdef CONFIG_SPI_FLASH_USE_4K_SECTORS
 	SECT_4K		= 1 << 0,
+#else
+	SECT_4K		= 0 << 0,
+#endif
 	SECT_32K	= 1 << 1,
 	E_FSR		= 1 << 2,
 	SST_BP		= 1 << 3,