SecurityPkg: Fix potential bug in Security Boot dxe.

SecurityPkg: Fix potential bug in Security Boot dxe.

v2: update hash value in SecureBootConfig.vfr to keep
them consistent with macro definition in SecureBootConfigImpl.h

since we removed the sha-1 definition in Hash table
and related macro, but the macro definition HashAlg index
may be value 4 which is exceed the range of the Hash
table array.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Zhang Lubo <lubo.zhang@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Long Qin <qin.long@intel.com>
Cc: Yao Jiewen <jiewen.yao@intel.com>
Reviewed-by: Chao Zhang <chao.b.zhang@intel.com>