hw/input/stellaris_input: Rename to stellaris_gamepad

This source file implements a stellaris gamepad device; rename
it so that it is a closer match to the device name.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20231030114802.3671871-2-peter.maydell@linaro.org
diff --git a/hw/arm/stellaris.c b/hw/arm/stellaris.c
index aa5b0dd..96585dd 100644
--- a/hw/arm/stellaris.c
+++ b/hw/arm/stellaris.c
@@ -23,7 +23,7 @@
 #include "sysemu/sysemu.h"
 #include "hw/arm/armv7m.h"
 #include "hw/char/pl011.h"
-#include "hw/input/gamepad.h"
+#include "hw/input/stellaris_gamepad.h"
 #include "hw/irq.h"
 #include "hw/watchdog/cmsdk-apb-watchdog.h"
 #include "migration/vmstate.h"