Move nist-sip from ext.jar to voip-common.jar

No component other than voip-common uses it.

Test: basic sanity
Bug: 140872785
Change-Id: Ie8c9a7266d1ed9ea67b43c9267610e236b6e547a

Android.bp

@@ -502,7 +502,6 @@ java_library {
     sdk_version: "core_platform",
     static_libs: [
         "libphonenumber-platform",
-        "nist-sip",
         "tagsoup",
         "rappor",
         "libtextclassifier-java",

CleanSpec.mk

@@ -253,6 +253,7 @@ $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/media/audio)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/priv-app/DynamicAndroidInstallationService)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/priv-app/DefaultContainerService)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/CaptivePortalLogin)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/framework/ext.jar)
 # ******************************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST ABOVE THIS BANNER
 # ******************************************************************