After building, you should obtain this tree:
output/images/
+ +-- bcm2708-rpi-b-rev1.dtb [1]
+-- bcm2708-rpi-b.dtb [1]
+-- bcm2708-rpi-b-plus.dtb [1]
+-- bcm2708-rpi-cm.dtb [1]
# 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="broadcom/bcm2708-rpi-b broadcom/bcm2708-rpi-b-plus broadcom/bcm2708-rpi-cm"
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="broadcom/bcm2708-rpi-b-rev1 broadcom/bcm2708-rpi-b broadcom/bcm2708-rpi-b-plus broadcom/bcm2708-rpi-cm"
BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y