qemu-log: Unify {cpu_set,set_cpu}_log_filename as qemu_set_log_filename

The qemu_log() functionality is no longer specific to TCG CPU debug logs.
Rename cpu_set_log_filename() to qemu_set_log_filename() and drop the
pointless wrapper set_cpu_log_filename().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/linux-user/main.c b/linux-user/main.c
index 7902f3b..4beb5c9 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -3113,7 +3113,7 @@
 
 static void handle_arg_log_filename(const char *arg)
 {
-    cpu_set_log_filename(arg);
+    qemu_set_log_filename(arg);
 }
 
 static void handle_arg_set_env(const char *arg)
@@ -3480,7 +3480,7 @@
 #endif
 
     /* init debug */
-    cpu_set_log_filename(log_file);
+    qemu_set_log_filename(log_file);
     optind = parse_args(argc, argv);
 
     /* Zero out regs */