hw/pl011: Use LOG_UNIMP and LOG_GUEST_ERROR

Use the new LOG_UNIMP and LOG_GUEST_ERROR logging types rather
than hw_error().
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

hw/pl011.c

@@ -107,7 +107,8 @@ static uint64_t pl011_read(void *opaque, target_phys_addr_t offset,
     case 18: /* UARTDMACR */
         return s->dmacr;
     default:
-        hw_error("pl011_read: Bad offset %x\n", (int)offset);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "pl011_read: Bad offset %x\n", (int)offset);
         return 0;
     }
 }
@@ -178,11 +179,13 @@ static void pl011_write(void *opaque, target_phys_addr_t offset,
         break;
     case 18: /* UARTDMACR */
         s->dmacr = value;
-        if (value & 3)
-            hw_error("PL011: DMA not implemented\n");
+        if (value & 3) {
+            qemu_log_mask(LOG_UNIMP, "pl011: DMA not implemented\n");
+        }
         break;
     default:
-        hw_error("pl011_write: Bad offset %x\n", (int)offset);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "pl011_write: Bad offset %x\n", (int)offset);
     }
 }