android: Don't rely on indirect inclusion of unistd.h

The standard C library close() and lseek() functions require inclusion
of the unistd.h header. Include it explicitly where needed instead of
relying on indirect inclusion.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Tested-by: Paul Elder <paul.elder@ideasonboard.com>

src/android/mm/generic_camera_buffer.cpp

@@ -7,6 +7,8 @@
 
 #include "../camera_buffer.h"
 
+#include <unistd.h>
+
 #include "libcamera/internal/buffer.h"
 #include "libcamera/internal/log.h"