QcomModulePkg : Fix dtb header corruption due to kernel size

There may exist a case where due to dynamic kernel size dtb
header might get corrupted.

This patch updates the kernel64_hdr structure and uses the
ImageSize in the kernel64_hdr for the dtb header corruption
check.

Change-Id: Ib7b7d10b718ffbf808c200958f304525913b9e2e
2 files changed