BoardModulePkg: Copy device path before processing

GCC compiler puts the DevicePath PCDs to the read-only
section. During boot if try to process the device path
after PtrGetPtr it throws a page fault exception.

Hence making a local copy using DuplicateDevicePath()
to avoid the page fault exception.

Cc: Isaac Oram <isaac.w.oram@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>

Signed-off-by: Abdul Lateef Attar <abdattar@amd.com>
Reviewed-by: : Isaac Oram <isaac.w.oram@intel.com>