gdbstub: Avoid including 'cpu.h' in 'gdbstub/helpers.h'

We only need the "exec/tswap.h" and "cpu-param.h" headers.
Only include "cpu.h" in the target gdbstub.c source files.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240418192525.97451-20-philmd@linaro.org>

include/gdbstub/helpers.h

@@ -16,7 +16,8 @@
 #error "gdbstub helpers should only be included by target specific code"
 #endif
 
-#include "cpu.h"
+#include "exec/tswap.h"
+#include "cpu-param.h"
 
 /*
  * The GDB remote protocol transfers values in target byte order. As

target/avr/gdbstub.c

@@ -20,6 +20,7 @@
 
 #include "qemu/osdep.h"
 #include "gdbstub/helpers.h"
+#include "cpu.h"
 
 int avr_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
 {

target/tricore/gdbstub.c

@@ -19,6 +19,7 @@
 
 #include "qemu/osdep.h"
 #include "gdbstub/helpers.h"
+#include "cpu.h"
 
 
 #define LCX_REGNUM         32