Update Makefiles

- In emulator/Makefile, update `clean` target to remove .log and .vcd
- In Makefrag, added `CONFIG_TYPE` variable to pass desired Config while building a verilator model.
     -By default, it stores the `DefaultConfig`
     -But can be updated at command line.
	For example, running `make debug CONFIG_TYPE=BitManipCryptoConfig` will build the verilator model
	using `BitManipCryptoConfig`.

Signed-off-by: Abdul Wadood <abdulwadood.afzal88@gmail.com>

Author: Abdulwadoodd

Makefrag

@@ -3,10 +3,11 @@ ifndef RISCV
 $(error Please set environment variable RISCV. Please take a look at README)
 endif
 
+CONFIG_TYPE ?= DefaultConfig
 MODEL ?= TestHarness
 PROJECT ?= freechips.rocketchip.system
 CFG_PROJECT ?= $(PROJECT)
-CONFIG ?= $(CFG_PROJECT).DefaultConfig
+CONFIG ?= $(CFG_PROJECT).$(CONFIG_TYPE)
 # TODO: For now must match rocketchip.Generator
 comma := ,
 space := $() $()

emulator/Makefile

@@ -21,7 +21,7 @@ all: $(emu)
 debug: $(emu_debug)
 
 clean:
-	rm -rf *.o *.a emulator-* $(generated_dir) $(generated_dir_debug) DVEfiles $(output_dir)
+	rm -rf *.o *.vcd *.log *.a emulator-* $(generated_dir) $(generated_dir_debug) DVEfiles $(output_dir)
 
 .PHONY: default all debug clean