bootstd: sata: bootdev scanning for ahci sata with no drive attached

bootstd: sata: bootdev scanning for ahci sata with no drive attached

It's normal to have no SATA drive attached to the controller, so return a
successful status when there is no block device found after probing.

Note: this patch depends on the previous patch
https://patchwork.ozlabs.org/project/uboot/patch/20230917230649.30357-1-mibodhi@gmail.com/

Resend the right patch.

Signed-off-by: Tony Dinh <mibodhi@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>