MdeModulePkg/Variable: Parameterize auth status in VariableParsing

MdeModulePkg/Variable: Parameterize auth status in VariableParsing

The file VariableParsing.c provides generic functionality related
to parsing variable related structures and information. In order to
calculate offsets for certain operations, the functions must know if
authenticated variables are enabled as this increases the size of
variable headers.

This change removes linking against a global variable in an external file
in favor of passing the authenticated variable status as a parameter to
the variable parsing functions.

Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Michael Kubacki <michael.a.kubacki@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>