[gpuservice] allow "adb shell cmd gpu vkjson"

Also allow adb shell dumpsys gpu to not return error.

Bug: 120095213
Test: flash non-eng build and adb shell cmd gpu vkjson
Change-Id: Ia4a50a475ce76ec35e082dd52d4a6c80dde7f571
diff --git a/private/gpuservice.te b/private/gpuservice.te
index 6cbd89c..5e8aab5 100644
--- a/private/gpuservice.te
+++ b/private/gpuservice.te
@@ -22,6 +22,9 @@
 allow gpuservice graphics_device:dir search;
 allow gpuservice graphics_device:chr_file rw_file_perms;
 
+# Needed for dumpsys pipes.
+allow gpuservice shell:fifo_file write;
+
 # Use socket supplied by adbd, for cmd gpu vkjson etc.
 allow gpuservice adbd:unix_stream_socket { read write getattr };