MdeModulePkg/PlatformVarCleanupLib: fix HiiConstructConfigHdr() call

MdeModulePkg/PlatformVarCleanupLib: fix HiiConstructConfigHdr() call

The HiiConstructConfigHdr() function takes the "DriverHandle" parameter in
order to fetch the device path from it, and then turn the device path into
PATH routing information.

The HiiConstructConfigHdr() function is called from
VariableCleanupHiiExtractConfig(), which is only installed when "Type" is
"VarCleanupManually" in PlatformVarCleanup().

In that case, we create "Private->DriverHandle" as a new handle, and
install "mVarCleanupHiiVendorDevicePath" on it. Then we pass
"Private->DriverHandle" to HiiAddPackages(), which consumes the device
path for routing purposes.

It follows that the "DriverHandle" argument passed to
HiiConstructConfigHdr() should be the same driver handle, for matching
routing.

Currently we pass "Private->HiiHandle", which is clearly a typo, because
it is the return value of HiiAddPackages(), and stands for the published
HII package list.

Therefore this patch addresses an actual bug.

The typo has not been flagged by compilers because the UEFI spec
regrettably defines both EFI_HANDLE and EFI_HII_HANDLE as (VOID*).

Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>