bootstd: Scan all bootdevs in a boot_targets entry (take 2)

When the boot_targets environment variable is used with the distro-boot
scripts, each device is included individually. For example, if there
are three mmc devices, then we will have something like:

   boot_targets="mmc0 mmc1 mmc2"

In contrast, standard boot supports specifying just the uclass, i.e.:

   boot_targets="mmc"

The intention is that this should scan all MMC devices, but in fact it
currently only scans the first.

Update the logic to handle this case, without required BOOTSTD_FULL to
be enabled.

Signed-off-by: Simon Glass <[email protected]>
Reported-by: Date Huang <[email protected]>
Reported-by: Vincent Stehlé <[email protected]>
Reported-by: Ivan Ivanov <[email protected]>
Tested-by: Ivan T.Ivanov <[email protected]>

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