Add SELinux policies for blastula pool sockets.

This patch adds the necessary SELinux contexts for the blastula pool
sockets.

Topic: zygote-prefork
Test: make & flash & check log for message
Bug: 68253328
Change-Id: I46d62e5ab8c573cb7704feec2b1d42d91a990fd9

private/file_contexts

@@ -154,6 +154,8 @@
 /dev/socket/wpa_wlan[0-9] u:object_r:wpa_socket:s0
 /dev/socket/zygote	u:object_r:zygote_socket:s0
 /dev/socket/zygote_secondary	u:object_r:zygote_socket:s0
+/dev/socket/blastula_pool	u:object_r:zygote_socket:s0
+/dev/socket/blastula_pool_secondary	u:object_r:zygote_socket:s0
 /dev/spdif_out.*	u:object_r:audio_device:s0
 /dev/tty		u:object_r:owntty_device:s0
 /dev/tty[0-9]*		u:object_r:tty_device:s0