rockchip: rk3588-rock-5b: Fix SPI Flash alias

The commit fd6e425b ("rockchip: rk3588-rock-5b: Enable boot from SPI
NOR flash") enabled SPI flash support by adding a spi0 alias.

Correct this by adding spi0-spi5 aliases in rk3588s-u-boot.dtsi and
SF_DEFAULT_BUS=5 and SPL_DM_SEQ_ALIAS=y in defconfig. Also enabled
support for parsing and auto discovery of parameters, SFDP.

Fixes: fd6e425b ("rockchip: rk3588-rock-5b: Enable boot from SPI NOR flash")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>