Crespo: Fix 2G/3G toggle widget

Since Crespo is not using the samsung RIL we need to add this
in order to solve the switch loop issue.

patch2: remove white space
patch3: add a gloval variable so this code can be reused on other devices
patch4: read the var only once, not every time

Change-Id: I42bd7105fb1b861a3f4e061e19192fd158b02b8d