Remove deprecated RcsService/PresencePolling apps

There is now an AOSP API for RCS UCE, removed the
deprecated RcsService/PresencePolling app targets.

Bug: 178489990
Test: make + inspect build
Merged-In: I0eaa321dfd75de8217c465a523d439ea702deea4
Change-Id: I0eaa321dfd75de8217c465a523d439ea702deea4

target/product/generic_system.mk

diff --git a/target/product/generic_system.mk b/target/product/generic_system.mk
index 9580ade..1f310c9 100644
--- a/target/product/generic_system.mk
+++ b/target/product/generic_system.mk
@@ -32,8 +32,6 @@
 PRODUCT_PACKAGES += \
     LiveWallpapersPicker \
     PartnerBookmarksProvider \
-    PresencePolling \
-    RcsService \
     Stk \
     Tag \
     TimeZoneUpdater \