Settings: Added cpu info and memory info to About Phone Settings

Strings already added in commit:
https://github.com/VanirAOSP/packages_apps_Settings/commit/8a5d851fd04d87cc8ce6873b326628f3b1cb0189

This is pulled from gingerbread. No code looked like it needed to
be re-done. This contains code from the following two commits.

shafty023<gameboy45@gmail.com>:
http://review.cyanogenmod.com/#change,1774

Keyan Mobli<persiansown@gmail.com>:
http://review.cyanogenmod.com/#change,1820

Patchset 2: Fix string constants
Patchset 3:
- Moved file paths to string constants
- Check for meminfo and cpuinfo files, if bad don't show preference
Patchset 4:
- Created variables for each operation.
- Wrote Long to print -1.
Patchset 5:
- Simplified and refactored
Patchset 6:
- Fix authorship herp derp
Patchset 7:
- Show only total memory, available memory would probably cause users to
  kill apps en masse.

Change-Id: Ib0550a5af515ae3a48481412c5c9c504cd80b743

Conflicts:
	res/xml/device_info_settings.xml