Fix install of a missed header from debug_rom.

The installed header files from the riscv subproject were incomplete, since
processor.h includes debug_rom_defines.h, and the latter was not installed.
Fix by moving it into riscv/, add it to the riscv subproject header list, which
ensures it will get installed.  While here, also add a missed dependency of debug_rom
on riscv/encoding.h to debug_rom/Makefile.

debug_rom/Makefile

@@ -7,7 +7,7 @@ OBJCOPY = $(RISCV)/bin/riscv64-unknown-elf-objcopy
 COMPILE = $(CC) -nostdlib -nostartfiles -I.. -Tlink.ld
 
 ELFS = debug_rom
-DEPS = debug_rom.S link.ld debug_rom_defines.h
+DEPS = debug_rom.S link.ld ../riscv/debug_rom_defines.h ../riscv/encoding.h
 
 all: $(patsubst %,%.h,$(ELFS))
 

debug_rom/debug_rom.S

@@ -1,8 +1,8 @@
 // See LICENSE.SiFive for license details.
 
 #include "riscv/encoding.h"
-#include "debug_rom_defines.h"
-        
+#include "riscv/debug_rom_defines.h"
+
         .option norvc
         .global entry
         .global exception

riscv/debug_module.cc

@@ -6,7 +6,7 @@
 #include "mmu.h"
 
 #include "debug_rom/debug_rom.h"
-#include "debug_rom/debug_rom_defines.h"
+#include "debug_rom_defines.h"
 
 #if 0
 #  define D(x) x

riscv/processor.h

@@ -9,7 +9,7 @@
 #include <string>
 #include <vector>
 #include <map>
-#include "debug_rom/debug_rom_defines.h"
+#include "debug_rom_defines.h"
 
 class processor_t;
 class mmu_t;