libutils -= libprocessgroup dep

:)

This pulls in quite a few things into a lot of processes. Removing it
separately, in case the use of SetTaskProfiles needs to be reverted,
removing this as well might cause that revert to have linker errors
if new static users of libutils are introduced in the meantime.

Bug: 208895940
Test: build
Change-Id: Iaf5b5d41328c1b1f50bb32be8a6a1bd3a0c3f22f

libutils/Android.bp

@@ -100,7 +100,6 @@ cc_defaults {
             cflags: ["-fvisibility=protected"],
 
             shared_libs: [
-                "libprocessgroup",
                 "libvndksupport",
             ],