unpack_bootimg: Refactor unpack_vendor_boot_image()
Straighten out the code of unpack_vendor_boot_image(), factor out common code to a helper class. Goal is to make the code easier to follow and to extend. Bug: 180712476 Test: atest --host mkbootimg_test Change-Id: Iae3b84050f44b16b179972fa7395bb14689c98f9
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