hammerhead: Update build fingerprint and description to 5.0.1 LRX22C

Fix a small derp in the blob file as well.

Change-Id: Ib67e32ff3858c651bd1eabe03487314f5396f515
Cleanup Obsolete LOCAL_PRELINK_MODULE.

Bug: 18675947
Change-Id: Ic00a367b5c108f4a7c18b3ab4d3a1da74cc97353
Suppress trivial warnings from clang compiler.

* Unused formal parameter names.
* Comparing array with null pointer.

Change-Id: I4ffc5a7a94b5bc5508b590686ce16d3ae5f579f4
Add hardware key overlays

Change-Id: I025a6aec71e223385a5bf0d2fde4f3ed6f5beaf5
Merge branch 'cm-12.0' of https://github.com/CyanogenMod/android_device_lge_hammerhead into lollipop