boot: android: Add bootconfig support

For android vendor boot image version 4 bootconfig is mandatory.[1]

In the android_image_get_ramdisk function, after copying both vendor and
boot ramdisks, we extract all androidboot.* entries from the kernel
command line. These entries are added to the bootconfig section.
We then update the sizes of the ramdisk and bootconfig.
Finally, all androidboot.* entries are removed from the kernel command
line.

[1] https://source.android.com/docs/core/architecture/partitions/vendor-boot-partitions#bootloader-support

Reviewed-by: Simon Glass <[email protected]>
Signed-off-by: Guillaume La Roque (TI.com) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[mkorpershoek: dropped irrelevant code comments]
Signed-off-by: Mattijs Korpershoek <[email protected]>

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