libril: Provide support for legacy ril

With change Icc620fd191f8542f61bd38e365813753bfedefdf, RIL_VERSION_MIN was
increased from 2 to 6, but this causes problems for a number of devices
using ril blobs older than that.

  E/RILC    (  140): RIL_register: version 4 is to old, min version is 6

Consequently causing the ril system unable to connect to the rild socket.

Change-Id: I82c1cc4dab8fcaa4ccaa099132133b0f3b1d8029
Merge branch 'kk4.4' of https://github.com/SlimRoms/hardware_ril into kk4.4
Revert "libril: Provide support for legacy ril"

This reverts commit 2db11a521ec1d1244594e5185dc775b024c6db9c.
Revert "Fix pthread_create error handling in ril."

This reverts commit 6cec2c225cf208defae06f3a9bee7486c420ba4c.
Revert "Stop the kernel complaining about rild."

This reverts commit ca81d26383e0eb3f261999d823d2260ffe5b4909.
Revert "Remove an outdated hack."

This reverts commit 975546f1b1437c9dabbe922ed15fe04a0c84ecc2.
Revert "Fix parameter mismatch between header and implementation"

This reverts commit 78d2cf709481feb3bdc14b05205a03e8e4c4bb25.