arm_gic: Do not force PPIs to edge-triggered mode

Only SGIs must be WI, done by forcing them to their default
(edge-triggered).

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Adam Lackorzynski <adam@os.inf.tu-dresden.de>
Message-id: 1408372255-12358-4-git-send-email-adam@os.inf.tu-dresden.de
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/intc/arm_gic.c

@@ -558,7 +558,7 @@ static void gic_dist_writeb(void *opaque, hwaddr offset,
         irq = (offset - 0xc00) * 4 + GIC_BASE_IRQ;
         if (irq >= s->num_irq)
             goto bad_reg;
-        if (irq < GIC_INTERNAL)
+        if (irq < GIC_NR_SGIS)
             value |= 0xaa;
         for (i = 0; i < 4; i++) {
             if (s->revision == REV_11MPCORE || s->revision == REV_NVIC) {