qcom-common: Only allow moto_msm8960/moto_msm8960_jbbl

* MSM8960DT and MSM8226 devices don't inherit from this repo anymore,
  so prevent them from including any modules listed.

Change-Id: I0830cdf875c95aa2e7fe0f15ea62638acf1e10f4
qcom-common: Generate guard for vendor directory

* Prevent MSM8960DT and MSM8226 device builds from having conflicting
  module names.

Change-Id: I2ddedbd801dcce231968d6580b8ede94d12170f8