settings: Remove ZRAM settings

 * Android has proper ZRAM support builtin now, and this code doesn't
   even work. Remove it.

Change-Id: I39cb20809d5c71683bffc578057ad39363c5066e

Conflicts:

	res/values-ca/cm_arrays.xml
	res/values-ca/cm_strings.xml
	res/values-es/cm_arrays.xml
	res/values-es/cm_strings.xml
	res/values-hu/cm_arrays.xml
	res/values-hu/cm_strings.xml
	res/values-it/cm_arrays.xml
	res/values-it/cm_strings.xml
	res/values-lt/cm_arrays.xml
	res/values-lt/cm_strings.xml
	res/values-nl/cm_arrays.xml
	res/values-nl/cm_strings.xml
	res/values-pl/cm_arrays.xml
	res/values-pl/cm_strings.xml
	res/values-pt/cm_arrays.xml
	res/values-pt/cm_strings.xml
	res/values-ru/cm_arrays.xml
	res/values-ru/cm_strings.xml
	res/values-th/cm_arrays.xml
	res/values-th/cm_strings.xml
	res/values-zh-rCN/cm_arrays.xml
	res/values-zh-rCN/cm_strings.xml