build: set data roaming always to false

NOTE: This is a temporary fix until the cause of the issue is found

some of our devices inherit this mk here and vendor slim does not overwrite it.
Thanks Kurre for pointing out

Change-Id: Ie2ef480add1ff1614fea1b986758ceb5330f0005
(cherry picked from commit bb6d36adf4c08924a1ac0c2818d5525fe881c9ac)

Conflicts:
	target/product/full_base_telephony.mk
Build: update qcom_utils.mk

Add build macro to determine Android Release

Adding platform sdk version 18 for JB MR2.

Change-Id: I79aa831ddd335bd14bd777506c210acc5d9960f1
(cherry picked from commit af35b5d458927b48f1d11e2d2ebecf2fff4a3883)