tools: kwboot: Add support for parsing SATA images with non-512 block size

Currently kwboot expected that sector size for SATA image is always 512
bytes. If SATA image cannot be parsed with sector size of 512 bytes, try
larger sector sizes which are power of two and up to the 32 kB. Maximal
theoretical value is 32 kB because ATA IDENTIFY command returns sector size
as 16-bit number.

Signed-off-by: Pali Rohár <pali@kernel.org>