MdePkg: Resolve type mismatch in node/text conversion for Wifi device

MdePkg: Resolve type mismatch in node/text conversion for Wifi device

Function DevPathFromTextWiFi() in use UINT8* and CHAR8* interchangeably,
which breaks the build on ARM. Pointer type conversion is added to
resolved this problem.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17488 6f19259b-4bc3-4df7-8a09-765794883524