serrano: Add back some sensor permissions

 * Was accidentally removed in a previous commit

Change-Id: I351fa076f4c03a93a8089ac55bc5367f31d7b3bc
serrano: Sync GPS HAL with CAF's kk_2.7_rb1.42 branch

 * Minus the following patch, as it's causing a missing symbol
   error when loading our proprietary libs:

   "Add a new LocAdapterProxyBase class"

Change-Id: Ia2e2de8928308151af710039d225b63aae2eff28
serrano: Remove TARGET_NO_RPC check from GPS HAL

 * We will not be building with RPC support anytime soon
   anyway, so just remove it.

Change-Id: I0157974b35dc612fe45821918b315fb6e447d85d
fstab: remove length parameter for encryption

* This is not needed and actually causes encryption to fail
  most of the time.

Change-Id: I86bdffccab213e4e06609c1c179666fab30ea7c6