PPC: 405: Fix ppc405ep initialization

When trying to run a ppc405 guest, it segfaults quite quickly, trying to
access timers that weren't initialized. Initialize them properly instead.

Reported-by: Andreas Faerber <afaerber@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

hw/ppc405_uc.c

@@ -2471,6 +2471,8 @@ CPUPPCState *ppc405ep_init(MemoryRegion *address_space_mem,
     ppc4xx_pob_init(env);
     /* OBP arbitrer */
     ppc4xx_opba_init(0xef600600);
+    /* Initialize timers */
+    ppc_booke_timers_init(env, sysclk, 0);
     /* Universal interrupt controller */
     irqs = g_malloc0(sizeof(qemu_irq) * PPCUIC_OUTPUT_NB);
     irqs[PPCUIC_OUTPUT_INT] =