Merge pull request #457 from efabless/caravan-mpw9-RTL-dev

Modified the HDL hierarchy of caravan to be consisting of caravan_core and chip_io_alt

manifest

@@ -5,7 +5,8 @@ cf40562ae6508f3dc5e81420e31f7b5886dc3c8f  verilog/rtl/__user_analog_project_wrap
 5f8e2d6670ce912bc209201d23430f62730e2627  verilog/rtl/__user_project_la_example.v
 cc82a78753f5f5d0a1519bd81adbcff8a4296d91  verilog/rtl/__user_project_wrapper.v
 3c8c04f53b2848dc46132cda82c614e06e56571b  verilog/rtl/buff_flash_clkrst.v
-7c2c90674cd597f4b0b6dc18b8b4bc28c7471faa  verilog/rtl/caravan.v
+8a23782a7870d50eb281d72bebf13320cd009813  verilog/rtl/caravan.v
+a3c5cbf5f6f56f7d5066b86d3de0d709f09432af  verilog/rtl/caravan_core.v
 06e92151b5928e3f28e30a5cde76f7dd6530ed91  verilog/rtl/caravan_netlists.v
 a3d12a2d2d3596800bec47d1266dce2399a2fcc6  verilog/rtl/caravan_openframe.v
 b532b4c6315c29fd19fe38ac221b6fc41e6f5ecb  verilog/rtl/caravan_power_routing.v