exec/cpu: Extract page-protection definitions to page-protection.h

Extract page-protection definitions from "exec/cpu-all.h"
to "exec/page-protection.h".

The list of files requiring the new header was generated
using:

$ git grep -wE \
  'PAGE_(READ|WRITE|EXEC|RWX|VALID|ANON|RESERVED|TARGET_.|PASSTHROUGH)'

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240427155714.53669-3-philmd@linaro.org>
diff --git a/target/m68k/helper.c b/target/m68k/helper.c
index 7a91f33..7967ad1 100644
--- a/target/m68k/helper.c
+++ b/target/m68k/helper.c
@@ -21,6 +21,7 @@
 #include "qemu/osdep.h"
 #include "cpu.h"
 #include "exec/exec-all.h"
+#include "exec/page-protection.h"
 #include "exec/gdbstub.h"
 #include "exec/helper-proto.h"
 #include "gdbstub/helpers.h"