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/tilegx/cpu-param.h

@@ -0,0 +1,17 @@
+/*
+ * TILE-Gx cpu parameters for qemu.
+ *
+ * Copyright (c) 2015 Chen Gang
+ * SPDX-License-Identifier: LGPL-2.0+
+ */
+
+#ifndef TILEGX_CPU_PARAM_H
+#define TILEGX_CPU_PARAM_H 1
+
+#define TARGET_LONG_BITS 64
+#define TARGET_PAGE_BITS 16  /* TILE-Gx uses 64KB page size */
+#define TARGET_PHYS_ADDR_SPACE_BITS 42
+#define TARGET_VIRT_ADDR_SPACE_BITS 64
+#define NB_MMU_MODES 1
+
+#endif