zynq_slcr: Fixed ResetValues enum

There is a gap in the reset region of the address space at offset 0x208. This
throws out all these enum values by one when translating them to address offsets.
Fixed by putting the corresponding gap in the enum as well.

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/zynq_slcr.c

@@ -91,7 +91,7 @@ typedef enum {
 typedef enum {
   PSS,
   DDDR,
-  DMAC,
+  DMAC = 3,
   USB,
   GEM,
   SDIO,