Remove crash_dump from sys_ptrace neverallow exception

CAP_SYS_PTRACE is no longer used by crash_dump. There's no reason to
exclude it from the neverallow compile time assertion.

Test: policy compiles.
Change-Id: Ib2dced19091406553c16e6ce538cfb68bbc1e5aa

private/domain.te

@@ -8,7 +8,6 @@ allow domain crash_dump:process sigchld;
 neverallow {
   domain
   -vold
-  -crash_dump
   -dumpstate
   -storaged
   -system_server