IntelSiliconPkg/IntelSiliconPkg.dec: drop bogus semicolon from GUID def

IntelSiliconPkg/IntelSiliconPkg.dec: drop bogus semicolon from GUID def

The DEC spec doesn't allow the trailing semicolon:

  2.6 [Guids] Usage

  GuidCName = {C Format Guid Value} # Comment

Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>