wl12xx_build: update for ol_r5.sp5.01

* Update the wl12xx wlan build script for fetching ol_r5.sp5.01 version
* Modify fo creating the compat-wireless package on the fly from
  TI_OpenLik project in github
* Remove redundant parts used with older releases.

Signed-off-by: Eyal Reizer <eyalr@ti.com>