Remove a type that was never used.

This type was added in Ifbb539ff40c63377f58b3dc38898e1d1a9737582,
although it was not used, and the daemon that should have used it was
removed in I671f019871f7358f6ece43250b0adb5e810e1dec.

Bug: 79551588
Test: Build policy
Change-Id: I16c64d7b1ddfe45e7d5addcfa6f1688e870c30b4
diff --git a/sepolicy/device.te b/sepolicy/device.te
index f2ca8ea..d8267b9 100644
--- a/sepolicy/device.te
+++ b/sepolicy/device.te
@@ -7,7 +7,6 @@
 type sg_device, dev_type;
 type ssr_device, dev_type;
 type thermal_device, dev_type;
-type pta_device, dev_type;
 
 type custom_ab_block_device, dev_type;
 type xbl_block_device, dev_type;