sdm845-common: initial import of WfdCommon.jar

Signed-off-by: Chenyang Zhong <zhongcy95@gmail.com>

wfd.mk

+PRODUCT_PACKAGES += \
+    WfdCommon
+
+PRODUCT_BOOT_JARS += \
+    WfdCommon

wfd/Android.bp

+dex_import {
+        name: "WfdCommon",
+        owner: "xiaomi",
+        jars: ["WfdCommon.jar"],
+}