brcm2708: update linux 4.9 patches to latest version

As usual these patches were extracted and rebased from the raspberry pi repo:
https://github.com/raspberrypi/linux/tree/rpi-4.9.y

- Remove led1 from diag.sh for RPi3 since it causes boot issues.
- Fix modules.mk typos.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

target/linux/brcm2708/patches-4.9/0017-spi-bcm2835-Remove-unused-code.patch

@@ -1,4 +1,4 @@
-From 85bb42acd1c5a045d372d187c26b77c6bf1b617a Mon Sep 17 00:00:00 2001
+From 21f7f9d8146dd9e5a860198781febf78aafee3d1 Mon Sep 17 00:00:00 2001
 From: Phil Elwell <phil@raspberrypi.org>
 Date: Tue, 8 Nov 2016 21:35:38 +0000
 Subject: [PATCH] spi-bcm2835: Remove unused code