It is controled by the feature you declared in your board. You can have it as below:
imx6/sabresd_6dq.mk
@@ -29,7 +29,6 @@ PRODUCT_COPY_FILES += \
frameworks/native/data/etc/android.hardware.wifi.direct.xml:system/etc/permissions/android.hardware.wifi.direct.xml \
frameworks/native/data/etc/android.hardware.sensor.light.xml:system/etc/permissions/android.hardware.sensor.light.xml \
frameworks/native/data/etc/android.hardware.sensor.accelerometer.xml:system/etc/permissions/android.hardware.sensor.accelerometer.xml \
+ frameworks/native/data/etc/android.hardware.telephony.gsm.xml:system/etc/permissions/android.hardware.telephony.gsm.xml \
frameworks/native/data/etc/android.hardware.faketouch.xml:system/etc/permissions/android.hardware.faketouch.xml \
frameworks/native/data/etc/android.hardware.sensor.barometer.xml:system/etc/permissions/android.hardware.sensor.barometer.xml \
frameworks/native/data/etc/android.hardware.camera.front.xml:system/etc/permissions/android.hardware.camera.front.xml \
+++ b/sabresd_6dq/required_hardware.xml
@@ -25,8 +25,6 @@
-->
<feature name="android.hardware.location" />
<feature name="android.hardware.location.network" />
+ <feature name="android.hardware.telephony" />
+ <feature name="android.hardware.telephony.gsm" />
<feature name="android.hardware.wifi" />
<feature name="android.hardware.touchscreen" />
<feature name="android.hardware.touchscreen.multitouch" />