configs/raspberrypi: add dtb for compute module

[Peter: describe what 'CM' stands for, update comment]
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

board/raspberrypi/genimage-raspberrypi.cfg

@@ -3,6 +3,7 @@ image boot.vfat {
     files = {
       "bcm2708-rpi-b.dtb",
       "bcm2708-rpi-b-plus.dtb",
+      "bcm2708-rpi-cm.dtb",
       "rpi-firmware/bootcode.bin",
       "rpi-firmware/cmdline.txt",
       "rpi-firmware/config.txt",

configs/raspberrypi_defconfig

@@ -19,9 +19,9 @@ BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="d33d0293e245badc4ca6ede3984d8bb8ea63cb1a"
 BR2_LINUX_KERNEL_DEFCONFIG="bcmrpi"
 BR2_LINUX_KERNEL_ZIMAGE=y
 
-# Build the DTBs for A/B and A+/B+ from the kernel sources
+# Build the DTBs for A/B, A+/B+ and compute module from the kernel sources
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
-BR2_LINUX_KERNEL_INTREE_DTS_NAME="bcm2708-rpi-b bcm2708-rpi-b-plus"
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="bcm2708-rpi-b bcm2708-rpi-b-plus bcm2708-rpi-cm"
 
 BR2_PACKAGE_RPI_FIRMWARE=y
 # BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAYS is not set