wifi - Remove redundancy behavior when wlan.driver.status=ok

1. ag/6722341 will set WLAN driver/FW when start legacy HAL.
   So, remove the init.qcom.wlan.sh which do the same thing.

2. pa/1320338 will gives correct permission to power_stats.
   So, remove the original design that change permission when
   "wlan.driver.status=ok"

Bug: 139846860
Test: Property with wlan driver/FW version at enforcing mode.
      It can be verified by the below command:
      # adb shell getprop vendor.wlan.driver.version
      # adb shell getprop vendor.wlan.firmware.version

Change-Id: I61f22b31abc1eef869e21337cc501eeddb748dd0
3 files changed