cm.mk: Clean up makefile

Override CM's common_mini_phone.mk with a local tiny.mk based on
the one from:
	https://github.com/androidarmv6/android_vendor_cm/blob/cm-10.1/config/tiny.mk

This, plus overriding the included dictionaries to English only
trims around 30MB from the size of /system.

Should be sync'd from time to time with CM's vendor/cm/config/common.mk.
overlay: Add tiny.mk and override CM's dictionaries

Excluding CM's dictionaries and including English only saves us
21 MB.