procd: adjust /dev entries to desktop distro defaults

This changes the default permissions for /dev entries to be more similar to
a desktop distro. Taken from the defaults of Arch Linux and Ubuntu. Also
changed some that were nonsensical. For example, all 660 permissions on
desktop distros were of the form root:x where x is something other than
root. As such, 660 is useless for LEDE where the specific group is missing.
audio seems to be the only group that isn't.

Signed-off by: Rosen Penev <rosenp@gmail.com>

package/system/procd/files/hotplug.json

@@ -10,7 +10,7 @@
 					[ "if",
 						[ "or",
 							[ "eq", "DEVNAME",
-								[ "null", "full", "ptmx", "zero", "tty" ],
+								[ "null", "full", "ptmx", "zero", "tty", "net", "random", "urandom" ],
 							],
 							[ "regex", "DEVNAME",
 								[ "^gpio", "^hvc" ],
@@ -22,26 +22,16 @@
 						]
 					],
 					[ "if",
-						[ "or",
+						[ "eq", "DEVNAME", "kmsg" ],
-							[ "eq", "DEVNAME", "mapper/control" ],
+						[ "makedev", "/dev/%DEVNAME%", "0644" ],
-							[ "regex", "DEVPATH", "^ppp" ],
-						],
-						[
-							[ "makedev", "/dev/%DEVNAME%", "0600" ],
-							[ "return" ],
-						],
 					],
 					[ "if",
 						[ "regex", "DEVNAME", "^snd" ],
 						[ "makedev", "/dev/%DEVNAME%", "0660", "audio" ],
 					],
-					[ "if",
-						[ "regex", "DEVNAME", "^ttyS" ],
-						[ "makedev", "/dev/%DEVNAME%", "0664" ],
-					],
 					[ "if",
 						[ "has", "DEVNAME" ],
-						[ "makedev", "/dev/%DEVNAME%", "0644" ],
+						[ "makedev", "/dev/%DEVNAME%", "0600" ],
 					],
 				],
 			],