drop vold from sys_rawio neverallow exception

(cherry picked from commit 1df23cbf)

This does not appear needed anymore.

Bug: 27549740
Change-Id: I3128ab610c742b18008f4cfc2a7116b210f770e7

domain.te

@@ -165,7 +165,7 @@ neverallow {
 } self:capability mknod;
 
 # Limit raw I/O to these whitelisted domains.
-neverallow { domain -kernel -init -recovery -ueventd -watchdogd -healthd -vold -uncrypt -tee } self:capability sys_rawio;
+neverallow { domain -kernel -init -recovery -ueventd -watchdogd -healthd -uncrypt -tee } self:capability sys_rawio;
 
 # No process can map low memory (< CONFIG_LSM_MMAP_MIN_ADDR).
 neverallow * self:memprotect mmap_zero;