linux-ti-staging: stop using linux-dtb.inc
linux-ti-staging: stop using linux-dtb.inc

The Device Tree support is now handled by the kernel class. This patch
removes the inclusion of linux-dtb.inc from the kernel recipes in this
layer.

Signed-off-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>
Signed-off-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>

rcn-ee/meta-ti,rcn-ee/meta-ti,rcn-ee/meta-ti,rcn-ee/meta-ti