ioctl_defines: sort file

Sort file by ioctl name. This will make it hopefully easier to find
entries.

Alternatives considered: sorting file by ioctl value. This has the
advantage that it's easier to map an SELinux ioctlcmd= avc message into
a variable name, but would otherwise make this file harder to read.

Test: policy compiles.
Change-Id: I09b1dd4c055446f73185b90c4de5f3cdd98eb4b7