configs: ls1028aqds: Move CONFIG_SPI_FLASH_* definitions to defconfig

LS1028A-QDS has CONFIG_SPI_FLASH_SST and CONFIG_SPI_FLASH_EON defines
present in header. Move these entries from header to defconfigs.

Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/configs/ls1028aqds_tfa_lpuart_defconfig b/configs/ls1028aqds_tfa_lpuart_defconfig
index d016202..60d515c 100644
--- a/configs/ls1028aqds_tfa_lpuart_defconfig
+++ b/configs/ls1028aqds_tfa_lpuart_defconfig
@@ -55,7 +55,9 @@
 CONFIG_FSL_ESDHC=y
 CONFIG_MTD=y
 CONFIG_DM_SPI_FLASH=y
+CONFIG_SPI_FLASH_EON=y
 CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_SPI_FLASH_SST=y
 # CONFIG_SPI_FLASH_USE_4K_SECTORS is not set
 CONFIG_PHYLIB=y
 CONFIG_PHY_AQUANTIA=y