Revert "Add /system/bin/getprop as toolbox_exec"

This reverts commit d711d4d2.

Reason for revert: Shouldn't have submitted...

(cherry picked from commit e1b73b14)

Change-Id: I48054b667f5391d00ad40c43db5e23a4f42bbd2b

private/file_contexts

@@ -185,7 +185,6 @@
 /system/bin/tune2fs	--	u:object_r:fsck_exec:s0
 /system/bin/toolbox	--	u:object_r:toolbox_exec:s0
 /system/bin/toybox	--	u:object_r:toolbox_exec:s0
-/system/bin/getprop		u:object_r:toolbox_exec:s0
 /system/bin/logcat	--	u:object_r:logcat_exec:s0
 /system/bin/logcatd	--	u:object_r:logcat_exec:s0
 /system/bin/sh		--	u:object_r:shell_exec:s0