[yocto] [meta-raspberrypi][PATCH 2/5] README: fix outdated device tree info

[Petter Mabäcker]

After '6392a63 rpi-base.inc: Use KERNEL_DEVICETREE by default' was
introduced, the default value for 3.18+ kernels was changed. Ensure this
is reflected in the README.

Signed-off-by: Petter Mabäcker <petter at technux.se>
---
 README | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/README b/README
index a2ec4ca..3913f41 100644
--- a/README
+++ b/README
@@ -179,7 +179,8 @@ kernels.
           While creating the SDCard image, this modified kernel is put on
           boot partition (as kernel.img) as well as DeviceTree blobs (.dtb files).
 
-NOTE: KERNEL_DEVICETREE is empty by default.
+NOTE: KERNEL_DEVICETREE is default enabled for kernel >= 3.18 and always disabled for
+      older kernel versions.
 
 3. Extra apps
 =============
-- 
1.9.1