Remove pixelstats access to "/d/physical-memory-group-manager"

Now that these statistics have been moved to sysfs and b/185589010 is
fixed, remove these permission.

Test: build
Bug: 186500818
Change-Id: I2860564b3fe3710d85a104e4907a515d6beb8eca
diff --git a/pixelstats/pixelstats_vendor.te b/pixelstats/pixelstats_vendor.te
index e728992..4b43168 100644
--- a/pixelstats/pixelstats_vendor.te
+++ b/pixelstats/pixelstats_vendor.te
@@ -23,8 +23,6 @@
   allow pixelstats_vendor sysfs_ion:file r_file_perms;
   allow pixelstats_vendor sysfs_dma_heap:dir search;
   allow pixelstats_vendor sysfs_dma_heap:file r_file_perms;
-  allow pixelstats_vendor debugfs_mgm:dir r_dir_perms;
-  allow pixelstats_vendor debugfs_mgm:file r_file_perms;
   allow pixelstats_vendor kernel:dir search;
   allow pixelstats_vendor kernel:file r_file_perms;
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