Add a header-version argument to fastboot

The argument would set the boot header
version for flash:raw and boot
commands when they are used for boot
image creation.

Bug: 77154616
Test: Dumped the created boot image and checked
the header version using unpack_bootimg

Change-Id: I2c458996817615f4351db102b4234984108d47c0
Merged-In: I2c458996817615f4351db102b4234984108d47c0
(cherry picked from commit 88de5556)