Condense peripheral address map

This frees up additional space for new peripherals in the future.

litex_boards/targets/versa_ecp5.py

@@ -100,12 +100,12 @@ class BaseSoC(SoCCore):
         "ethmac"          : 0xc3002000,
         "bmcspiflashcfg"  : 0xc3004000,
         "hostspiflashcfg" : 0xc3005000,
-        "simplertc"       : 0xc3008000,
-        "openfsimaster"   : 0xc3009000,
-        "i2cmaster1"      : 0xc300a000,
-        "i2cmaster2"      : 0xc300a020,
-        "i2cmaster3"      : 0xc300a040,
-        "i2cmaster4"      : 0xc300a060,
+        "simplertc"       : 0xc3006000,
+        "openfsimaster"   : 0xc3007000,
+        "i2cmaster1"      : 0xc3008000,
+        "i2cmaster2"      : 0xc3008020,
+        "i2cmaster3"      : 0xc3008040,
+        "i2cmaster4"      : 0xc3008060,
         "bmcspiflash"     : 0xc4000000,
         "hostspiflash"    : 0xc8000000,
         "hostlpcslave"    : 0xcc000000,