wpa-supplicant-8-lib: Pick oem library path as per platform

Select the oem_lib_path according to the platform.
For Android, oem lib path can be /vendor/lib or /vendor/lib64
For LE, it will be /usr/lib.

Change-Id: I29c4b5bde220a14c1b3ea9752e3e0487694db5a6
CRs-fixed: 2828520