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/qemu-log.c b/qemu-log.c
index 30c9ab0..9a7e567 100644
--- a/qemu-log.c
+++ b/qemu-log.c
@@ -86,7 +86,7 @@
     }
 }
 
-void cpu_set_log_filename(const char *filename)
+void qemu_set_log_filename(const char *filename)
 {
     g_free(logfilename);
     logfilename = g_strdup(filename);