BaseTools: do basic check in FvImage with header size and signature
BaseTools: do basic check in FvImage with header size and signature

Add some basic check in FvImage with header size and signature.

Fixes: https://bugzilla.tianocore.org/show_bug.cgi?id=1181
Cc: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Cc: Yonghong Zhu <78d981fe33a016071af5222c56d5cf77f30fb0b2@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Zhiju.Fan <fdd95dd62d41cb6d1628623e2b008c48ac56856d@intel.com>
Reviewed-by: Yonghong Zhu <78d981fe33a016071af5222c56d5cf77f30fb0b2@intel.com>

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