init.rc: merge the zygote-start actions

The three actions for "zygote-start" are identical except for their
property triggers.  This seems to have been left over from when Android
supported both File Based Encryption (FBE) and Full Disk Encryption
(FDE), causing there to be four possible encryption states:

- ro.crypto.state=unsupported (No encryption configured)
- ro.crypto.state=encrypted && ro.crypto.type=file (FBE enabled)
- ro.crypto.state=unencrypted (FDE supported but disabled)
- ro.crypto.state=encrypted && ro.crypto.type=block (FDE enabled)

It seems that the reason the zygote-start action was duplicated three
times was to exclude the "FDE enabled" case, which could only be done by
explicitly listing the other three cases.

However, now that FDE is no longer supported, only the first two cases
are possible.  Therefore, zygote-start can just be the whole trigger.

Bug: 208476087
Test: presubmit
Change-Id: Icd6e4b0d2fb3f9f20595c0af4e2e35350564da8d

rootdir/init.rc

@@ -533,7 +533,7 @@ on late-init
     # Should be before netd, but after apex, properties and logging is available.
     trigger load_bpf_programs
 
-    # Now we can start zygote for devices with file based encryption
+    # Now we can start zygote.
     trigger zygote-start
 
     # Remove a file to wake up anything waiting for firmware.
@@ -1056,25 +1056,7 @@ on post-fs-data
 
 # It is recommended to put unnecessary data/ initialization from post-fs-data
 # to start-zygote in device's init.rc to unblock zygote start.
-on zygote-start && property:ro.crypto.state=unencrypted
-    wait_for_prop odsign.verification.done 1
-    # A/B update verifier that marks a successful boot.
-    exec_start update_verifier_nonencrypted
-    start statsd
-    start netd
-    start zygote
-    start zygote_secondary
-
-on zygote-start && property:ro.crypto.state=unsupported
-    wait_for_prop odsign.verification.done 1
-    # A/B update verifier that marks a successful boot.
-    exec_start update_verifier_nonencrypted
-    start statsd
-    start netd
-    start zygote
-    start zygote_secondary
-
-on zygote-start && property:ro.crypto.state=encrypted && property:ro.crypto.type=file
+on zygote-start
     wait_for_prop odsign.verification.done 1
     # A/B update verifier that marks a successful boot.
     exec_start update_verifier_nonencrypted