unicore32: rename PKUNITY_IOSPACE_BASE to PKUNITY_MMIO_BASE

for the term IOSPACE normally refers to the PCI PIO space
  -- by advice with Arnd Bergmann
Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>

arch/unicore32/include/mach/PKUnity.h

@@ -21,7 +21,7 @@
  * Memory Definitions
  */
 #define PKUNITY_SDRAM_BASE		0x00000000 /* 0x00000000 - 0x7FFFFFFF 2GB */
-#define PKUNITY_IOSPACE_BASE            0x80000000 /* 0x80000000 - 0xFFFFFFFF 2GB */
+#define PKUNITY_MMIO_BASE		0x80000000 /* 0x80000000 - 0xFFFFFFFF 2GB */
 #define PKUNITY_PCI_BASE		0x80000000 /* 0x80000000 - 0xBFFFFFFF 1GB */
 #include "regs-pci.h"
 #define PKUNITY_BOOT_ROM2_BASE		0xF4000000 /* 0xF4000000 - 0xF7FFFFFF 64MB */

arch/unicore32/include/mach/hardware.h

@@ -17,8 +17,8 @@
 
 #include "PKUnity.h"
 
-#define io_p2v(x)	((x) - PKUNITY_IOSPACE_BASE)
-#define io_v2p(x)	((x) + PKUNITY_IOSPACE_BASE)
+#define io_p2v(x)	((x) - PKUNITY_MMIO_BASE)
+#define io_v2p(x)	((x) + PKUNITY_MMIO_BASE)
 
 #ifndef __ASSEMBLY__