healthd-ext: add health-vendor-product.mk file to include target

Add health-vendor-product.mk file and include health HAL target into
PRODUCT_PACKAGE in it.

Change-Id: Ifac2ac813ee0b2475c7ad20d567e994116c94887
diff --git a/health-vendor-product.mk b/health-vendor-product.mk
new file mode 100644
index 0000000..d488b82
--- /dev/null
+++ b/health-vendor-product.mk
@@ -0,0 +1,2 @@
+PRODUCT_PACKAGES += android.hardware.health@2.1-impl-qti
+PRODUCT_PACKAGES += android.hardware.health@2.1-service