BaseTools: Update the FV region name as upper letter
BaseTools: Update the FV region name as upper letter

Since in the GenFds phase, the FV is generated as upper letter. This
patch update the FV region name as upper letter, it can fix the build
report generate failure on case sensitive file system.

Cc: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <78d981fe33a016071af5222c56d5cf77f30fb0b2@intel.com>
Reviewed-by: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Reviewed-by: Andrew Fish <be8d29debaaf5173b4b7ecb4ace852732e71f7b9@apple.com>

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