m68k: Use IS_ENABLED() instead of checking for built-in or module

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
diff --git a/arch/m68k/amiga/config.c b/arch/m68k/amiga/config.c
index ec9cc1f..ddb8192 100644
--- a/arch/m68k/amiga/config.c
+++ b/arch/m68k/amiga/config.c
@@ -396,7 +396,7 @@
 	mach_max_dma_address = 0xffffffff;
 
 	mach_reset           = amiga_reset;
-#if defined(CONFIG_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE)
+#if IS_ENABLED(CONFIG_INPUT_M68K_BEEP)
 	mach_beep            = amiga_mksound;
 #endif