EmulatorPkg/Sec: Change scope of PpiArray[10]

EmulatorPkg/Sec: Change scope of PpiArray[10]

The local variable PpiArray[10] is declared in the middle
of the SEC module _ModuleEntryPoint() with its own scope.
However, PpiArray has a dangling reference to its location
on the stack after the scope is closed.  This causes issues
with some compilers (e.g. XCODE5).

The fix is to move the declaration of PpiArray[10] to
the beginning of the function, so it is scoped correctly
for all references to this local variable and references
to its location.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Signed-off-by: Andrew Fish <afish@apple.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Tested-by: Andrew Fish <afish@apple.com>