Remove racoon, mtpd, pppd, ip-up-vpn

Legacy VPN types are removed. These are now unused.

Bug: 161776767
Test: m
Change-Id: I2ccc10d9c8680a6de9160e07e726312bc7b1fdc9

target/product/base_system.mk

@@ -125,7 +125,6 @@ PRODUCT_PACKAGES += \
     IntentResolver \
     ip \
     iptables \
-    ip-up-vpn \
     javax.obex \
     keystore2 \
     credstore \
@@ -223,7 +222,6 @@ PRODUCT_PACKAGES += \
     mkfs.erofs \
     monkey \
     mtectrl \
-    mtpd \
     ndc \
     netd \
     NetworkStack \
@@ -237,13 +235,11 @@ PRODUCT_PACKAGES += \
     ping6 \
     platform.xml \
     pm \
-    pppd \
     preinstalled-packages-asl-files.xml \
     preinstalled-packages-platform.xml \
     printflags \
     privapp-permissions-platform.xml \
     prng_seeder \
-    racoon \
     recovery-persist \
     resize2fs \
     rss_hwm_reset \