arm: socfpga: sr1500: Undefine CONFIG_SPI_FLASH_USE_4K_SECTORS

Undefine CONFIG_SPI_FLASH_USE_4K_SECTORS for UBI
and UBIFS support on serial NOR flash

Signed-off-by: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Dinh Nguyen <dinh.linux@gmail.com>
Cc: Pavel Machek <pavel@denx.de>
Cc: Marek Vasut <marex@denx.de>
Cc: Stefan Roese <sr@denx.de>
diff --git a/configs/socfpga_sr1500_defconfig b/configs/socfpga_sr1500_defconfig
index 2c75bda..3d98a63 100644
--- a/configs/socfpga_sr1500_defconfig
+++ b/configs/socfpga_sr1500_defconfig
@@ -17,3 +17,4 @@
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_SYS_NS16550=y
 CONFIG_DM_MMC=y
+# CONFIG_SPI_FLASH_USE_4K_SECTORS is not set