rockchip: Pinebook Pro: Fix SPI flash and store env on it

Some minor fixes for SPI flash on the Pinebook Pro and also
default to saving environment to the SPI flash as it's
guaranteed to be on board.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
(applied with make savedefconfig)
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
3 files changed