hw & trustzone: fix alignm. of VM exception-vector

After modifying mode transition for branch prediction tz_vmm wasn't
working anymore on hw_imx53_tz but the modifications had nothing to do
with the VM code. However, the amount of instructions in the MT before the
VM exception-vector changed. So I tried stuffing the last working version with
NOPs and found that tz_vmm worked for some NOP amounts and for others not.
Thus, I increased the alignment of the VM exception-vector from 16 bytes to 32
bytes, é voila, its working with any amount of NOPs as well as with branch
prediction commits.

ref #474

repos/base-hw/src/core/spec/arm_v7/mode_transition.s

@@ -434,7 +434,7 @@
 	 * On vm exceptions the CPU has to jump to one of the following
 	 * 7 entry vectors to switch to a kernel context.
 	 */
-	.p2align 4
+	.p2align 5
 	.global _mon_kernel_entry
 	_mon_kernel_entry:
 		b _mon_rst_entry           /* reset                  */