tcg: Split out target/arch/cpu-param.h

For all targets, into this new file move TARGET_LONG_BITS,
TARGET_PAGE_BITS, TARGET_PHYS_ADDR_SPACE_BITS,
TARGET_VIRT_ADDR_SPACE_BITS, and NB_MMU_MODES.

Include this new file from exec/cpu-defs.h.

This now removes the somewhat odd requirement that target/arch/cpu.h
defines TARGET_LONG_BITS before including exec/cpu-defs.h, so push the
bulk of the includes within target/arch/cpu.h to the top.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/lm32/cpu.h

@@ -20,26 +20,20 @@
 #ifndef LM32_CPU_H
 #define LM32_CPU_H
 
-#define TARGET_LONG_BITS 32
-
-#define CPUArchState struct CPULM32State
-
 #include "qemu-common.h"
 #include "cpu-qom.h"
 #include "exec/cpu-defs.h"
+
+#define CPUArchState struct CPULM32State
+
 struct CPULM32State;
 typedef struct CPULM32State CPULM32State;
 
-#define NB_MMU_MODES 1
-#define TARGET_PAGE_BITS 12
 static inline int cpu_mmu_index(CPULM32State *env, bool ifetch)
 {
     return 0;
 }
 
-#define TARGET_PHYS_ADDR_SPACE_BITS 32
-#define TARGET_VIRT_ADDR_SPACE_BITS 32
-
 /* Exceptions indices */
 enum {
     EXCP_RESET = 0,