MIPS: CPS: Set Status.BEV bit during early boot

Set the Status.BEV bit throughout the early startup of a secondary core
such that if an exception occurs the core branches to one of the
exception vector entries from cps-vec.S, rather than branching to
whatever is set in EBase.
Signed-off-by: NPaul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11200/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/kernel/cps-vec.S

@@ -71,7 +71,7 @@ not_nmi:
 	mtc0	t0, CP0_CAUSE
 
 	/* Setup Status */
-	li	t0, ST0_CU1 | ST0_CU0
+	li	t0, ST0_CU1 | ST0_CU0 | ST0_BEV
 	mtc0	t0, CP0_STATUS
 
 	/*