configs: ls1046a: Move SPI_FLASH_SPANSION to defconfig

Enable CONFIG_SPI_FLASH_SPANSION in defconfigs of LS1046ARDB and
LS1046AQDS which have two spansion flases i.e s25fs512s each of size
64M.

Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/configs/ls1046aqds_qspi_defconfig b/configs/ls1046aqds_qspi_defconfig
index b98101d..c31c374 100644
--- a/configs/ls1046aqds_qspi_defconfig
+++ b/configs/ls1046aqds_qspi_defconfig
@@ -42,6 +42,7 @@
 CONFIG_DM_MMC=y
 CONFIG_FSL_ESDHC=y
 # CONFIG_SPI_FLASH_BAR is not set
+CONFIG_SPI_FLASH_SPANSION=y
 # CONFIG_SPI_FLASH_USE_4K_SECTORS is not set
 CONFIG_PHYLIB=y
 CONFIG_PHYLIB_10G=y