rockchip: rockpro64: fix boot from SPI flash on spi1

rockchip: rockpro64: fix boot from SPI flash on spi1

Commit c4cea2bbf995 ("rockchip: Enable building a SPI ROM image on bob")
added an alias spi1 referring to spi@ff1d0000, however there was already
an alias spi0 referring to the same node in rockpro64's u-boot.dtsi, and
having both aliases present broke booting from SPI flash for this board.

Remove the spi0 alias, set the default bus for SPI flash to 1, and
enable support for numbered aliases in SPL so that it uses the same bus
numbering as U-Boot proper. This fixes booting from U-Boot in SPI flash
on the rockpro64 board.

Signed-off-by: Hugh Cole-Baker <sigmaris@gmail.com>
Suggested-by: Simon Glass <sjg@chromium.org>
Fixes: c4cea2bbf995 ("rockchip: Enable building a SPI ROM image on bob")
Reviewed-by: Kever Yang<kever.yang@rock-chips.com>