libcamera: Rename header guards for internal headers

With the internal headers now in include/libcamera/internal/, we may
have identically named headers in include/libcamera/. Their header
guards would clash. Rename the header guards of internal headers to
prevent any issue.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

include/libcamera/internal/byte_stream_buffer.h

@@ -4,8 +4,8 @@
  *
  * byte_stream_buffer.h - Byte stream buffer
  */
-#ifndef __LIBCAMERA_BYTE_STREAM_BUFFER_H__
-#define __LIBCAMERA_BYTE_STREAM_BUFFER_H__
+#ifndef __LIBCAMERA_INTERNAL_BYTE_STREAM_BUFFER_H__
+#define __LIBCAMERA_INTERNAL_BYTE_STREAM_BUFFER_H__
 
 #include <stddef.h>
 #include <stdint.h>
@@ -86,4 +86,4 @@ private:
 
 } /* namespace libcamera */
 
-#endif /* __LIBCAMERA_BYTE_STREAM_BUFFER_H__ */
+#endif /* __LIBCAMERA_INTERNAL_BYTE_STREAM_BUFFER_H__ */