sdm660-common: Create system copy of ims-ext-common and add to classpath

* Our ims.apk doesn't load ims-ext-common.jar, and it's moved to /product
   on 10 where PRODUCT_BOOT_JARS doesn't work.
 * Create a system copy of the jar and add it to boot classpath to make
   it loadable from the apk without extra work,

Change-Id: Ia530a530bd4469e12500410fc5e8ba393de60b18

ims/Android.bp

@@ -0,0 +1,7 @@
+java_library {
+    name: "ims-ext-common_system",
+    installable: true,
+    static_libs: [
+        "ims-ext-common",
+    ],
+}

sdm660.mk

@@ -405,7 +405,7 @@ PRODUCT_PACKAGES += \
     libprotobuf-cpp-full
 
 PRODUCT_PACKAGES += \
-    ims-ext-common \
+    ims-ext-common_system \
     ims_ext_common.xml \
     qti-telephony-hidl-wrapper \
     qti_telephony_hidl_wrapper.xml \
@@ -414,6 +414,7 @@ PRODUCT_PACKAGES += \
     telephony-ext
 
 PRODUCT_BOOT_JARS += \
+    ims-ext-common_system \
     telephony-ext
 
 # Seccomp policy