staging: vc04_services: bcm2835-audio: Drop include Makefile directive

Drop the include directive. They can break the build, when one only
wants to build a subdirectory. Replace with "../" for the includes,
in the bcm2835.h instead.
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Link: https://lore.kernel.org/r/20230120201104.606876-3-umang.jain@ideasonboard.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/bcm2835-audio/Makefile

 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_SND_BCM2835)	+= snd-bcm2835.o
 snd-bcm2835-objs		:= bcm2835.o bcm2835-ctl.o bcm2835-pcm.o bcm2835-vchiq.o
-
-ccflags-y += -I $(srctree)/$(src)/../include

drivers/staging/vc04_services/bcm2835-audio/bcm2835.h

@@ -6,11 +6,12 @@
 
 #include <linux/device.h>
 #include <linux/wait.h>
-#include <linux/raspberrypi/vchiq.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm-indirect.h>
 
+#include "../include/linux/raspberrypi/vchiq.h"
+
 #define MAX_SUBSTREAMS   (8)
 #define AVAIL_SUBSTREAMS_MASK  (0xff)