rockchip: rk3568-rock-3a: Fix SPI Flash alias

The commit 64f79f88a751 ("rockchip: rk3568-rock-3a: Enable boot from SPI
NOR flash") enabled SPI flash support by overriding the spi0 alias.

Correct this by adding a new spi4 alias in rk356x-u-boot.dtsi and
SF_DEFAULT_BUS=4 and SPL_DM_SEQ_ALIAS=y in defconfig. Also enabled
support for parsing and auto discovery of parameters, SFDP.

Fixes: 64f79f88a751 ("rockchip: rk3568-rock-3a: Enable boot from SPI NOR flash")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/configs/rock-3a-rk3568_defconfig b/configs/rock-3a-rk3568_defconfig
index 1e8256e..44ff054 100644
--- a/configs/rock-3a-rk3568_defconfig
+++ b/configs/rock-3a-rk3568_defconfig
@@ -57,6 +57,7 @@
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_OF_LIVE=y
 CONFIG_OF_SPL_REMOVE_PROPS="clock-names interrupt-parent assigned-clocks assigned-clock-rates assigned-clock-parents"
+CONFIG_SPL_DM_SEQ_ALIAS=y
 CONFIG_SPL_REGMAP=y
 CONFIG_SPL_SYSCON=y
 CONFIG_SCSI_AHCI=y
@@ -71,6 +72,8 @@
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_SDMA=y
 CONFIG_MMC_SDHCI_ROCKCHIP=y
+CONFIG_SF_DEFAULT_BUS=4
+CONFIG_SPI_FLASH_SFDP_SUPPORT=y
 CONFIG_SPI_FLASH_MACRONIX=y
 CONFIG_SPI_FLASH_XTX=y
 CONFIG_ETH_DESIGNWARE=y