UPSTREAM: usb: gadget:audio: Replace deprecated macro S_IRUGO

Use octal digits as suggested by checkpatch instead of the deprecated
macro.

Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Link: https://lore.kernel.org/r/20220121155308.48794-2-pavel.hofman@ivitera.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Bug: 235196743
(cherry picked from commit ce6a7bfb)
Change-Id: I3f15494218cd2b11e671e4eacb98e57ebf154f12
Signed-off-by: Luiz Matheus <luizmmat@motorola.com>