spl: Remove CONFIG_SPL_SATA_BOOT_DEVICE

This is only referenced in non-SPL_DM cases, of which there are
currently none.  Remove this option and slightly re-organize the code is
there is now never an if/else at the start of spl_sata_load_image()

Signed-off-by: Tom Rini <trini@konsulko.com>
2 files changed