ALSA: hdsp: Add missing inclusion of linux/vmalloc.h

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/rme9652/hdsp.c

@@ -28,6 +28,7 @@
 #include <linux/firmware.h>
 #include <linux/module.h>
 #include <linux/math64.h>
+#include <linux/vmalloc.h>
 
 #include <sound/core.h>
 #include <sound/control.h>