IntelFrameworkModulePkg GenericBdsLib: Potential read over memory boudary

IntelFrameworkModulePkg GenericBdsLib: Potential read over memory boudary

This commit will resolve the issue brought by r17733.

StringBuffer1 = AllocateCopyPool (
                  MAX_STRING_LEN * sizeof (CHAR16),
                  L"Configuration changed. Reset to apply it Now."
                  );

The above using of AllocateCopyPool() will read contents out of the scope
of the constant string. Potential risk for the constant string allocated
at the boundary of memory region.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17929 6f19259b-4bc3-4df7-8a09-765794883524