linux: handle new dtb location since 3.8-rc1

.dtb files are now generated in arch/$ARCH/boot/dts instead of
arch/$ARCH/boot, so extend the LINUX_INSTALL_DTB rule to look there
as well.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

linux/linux.mk

@@ -192,7 +192,10 @@ define LINUX_BUILD_DTB
 	$(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(KERNEL_DTBS)
 endef
 define LINUX_INSTALL_DTB
-	cp $(addprefix $(KERNEL_ARCH_PATH)/boot/,$(KERNEL_DTBS)) \
+	# dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
+	cp $(addprefix \
+		$(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
+		$(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
 		$(BINARIES_DIR)/
 endef
 endif