arm: socfpga: spl: Add support for booting from QSPI

Add code and configuration options to support booting from QSPI NOR.
Enable support for booting from QSPI NOR.

Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/configs/socfpga_socrates_defconfig b/configs/socfpga_socrates_defconfig
index 11bbff1..98894bb 100644
--- a/configs/socfpga_socrates_defconfig
+++ b/configs/socfpga_socrates_defconfig
@@ -11,3 +11,8 @@
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_SPL_DM=y
 CONFIG_SPL_MMC_SUPPORT=y
+CONFIG_DM_SEQ_ALIAS=y
+CONFIG_SPL_SIMPLE_BUS=y
+CONFIG_DM_SPI=y
+CONFIG_DM_SPI_FLASH=y
+CONFIG_SPL_SPI_SUPPORT=y