Update prebuilt kernel and modules
Various changes

* Enable BOARD_USES_QCOM_AUDIO_VOIPMUTE
* Use custom dalvik parameters from CAF
Remove stray camera fixup parameter
Set log_screen_metrics to hdpi

Default was mdpi.
Remove redundant mkdir lines

Already done in system wide init.rc
Fix typos
Switch back to GRALLOC_USAGE_HW_RENDER for camera preview
Use system heap for camera

Allows for freeing a few extra megabytes in kernel.
Experimental though until possible regressions have been ruled out.
Update prebuilt kernel and modules