Reland "sepolicy: fix zygote JIT permissions w.r.t. ashmem"

zygote now allocates JIT memory using libcutils API (aosp/1135101)
instead of going to /dev/ashmem directly, which requires execute
permissions to ashmem_libcutils_device.

Bug: 134434505
Change-Id: I3b5eeac1ec06d8d70da327743174ca83eec6b41c
Test: boot crosshatch
diff --git a/private/zygote.te b/private/zygote.te
index 66e14b3..d5e5420 100644
--- a/private/zygote.te
+++ b/private/zygote.te
@@ -53,7 +53,7 @@
 # Allow zygote to create JIT memory.
 allow zygote self:process execmem;
 allow zygote zygote_tmpfs:file execute;
-allow zygote ashmem_device:chr_file execute;
+allow zygote ashmem_libcutils_device:chr_file execute;
 
 # Execute idmap and dex2oat within zygote's own domain.
 # TODO:  Should either of these be transitioned to the same domain