Fix broken halt while in healthd charger mode

Reboots/halts aren't working in healthd charger mode. This is
causing high power draw in an unplugged, powered off state.

Steps to reproduce (on Nexus 5):
  Unplug device from USB charger/computer
  Turn device off
  Wait for device to turn off
  Plug in USB cable/charger
  Wait for charge animation (wait for animation, not just lightning bolt, may have to press power button briefly to get animation going)
  Wait for panel to turn off
  Unplug USB cable/charger
  Press power button again, notice screen turns on at some frame in the animation.
  (not important) Each press of the power button advances the animation
  Power on.
  Examine denials from /proc/last_kmsg

Addresses the following denials:

[   24.934809] type=1400 audit(12534308.640:8): avc:  denied  { write } for  pid=130 comm="healthd" name="sysrq-trigger" dev="proc" ino=4026533682 scontext=u:r:healthd:s0 tcontext=u:object_r:proc_sysrq:s0 tclass=file
[   24.935395] type=1400 audit(12534308.640:9): avc:  denied  { sys_boot } for  pid=130 comm="healthd" capability=22  scontext=u:r:healthd:s0 tcontext=u:r:healthd:s0 tclass=capability

Bug: 13229119
Change-Id: If14a9c373bbf156380a34fbd9aca6201997d5553

healthd.te

@@ -30,3 +30,5 @@ allow healthd input_device:chr_file r_file_perms;
 allow healthd tty_device:chr_file rw_file_perms;
 allow healthd ashmem_device:chr_file execute;
 allow healthd self:process execmem;
+allow healthd proc_sysrq:file rw_file_perms;
+allow healthd self:capability sys_boot;