BaseTools: Update GenFw tool to support -e -z option together
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1727
-e -z option is to generate EFI image with zero debug entry.
It can be used to check the EFI image in DEBUG build.
This fix also supports the case -t -z option together for TE image.
Signed-off-by: Liming Gao <liming.gao@intel.com> Cc: Bob Feng <bob.c.feng@intel.com> Reviewed-by: Feng Bob C <bob.c.feng@intel.com>