configs: ls1046aqds: Move CONFIG_SPI_FLASH_* definitions to defconfigs

LS1046A-QDS has CONFIG_SPI_FLASH_SST, CONFIG_SPI_FLASH_EON and
CONFIG_SPI_FLASH_STMICRO defines present in header. Move these entries
from header to defconfigs.

Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
[Rebased]
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/configs/ls1046aqds_lpuart_defconfig b/configs/ls1046aqds_lpuart_defconfig
index be81f39..0e919045 100644
--- a/configs/ls1046aqds_lpuart_defconfig
+++ b/configs/ls1046aqds_lpuart_defconfig
@@ -64,6 +64,9 @@
 CONFIG_NAND_FSL_IFC=y
 CONFIG_SYS_NAND_ONFI_DETECTION=y
 CONFIG_SF_DEFAULT_BUS=1
+CONFIG_SPI_FLASH_EON=y
+CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_SPI_FLASH_SST=y
 CONFIG_PHYLIB=y
 CONFIG_PHYLIB_10G=y
 CONFIG_PHY_REALTEK=y