build: image: Fix off-by-one in DTC kernel version checks

It was reported to me on IRC today, that my change causes issues with
kernel versions between 4.14 and 4.19.

It's because I've wrongly used `git describe` in order to get kernel
version where we should disable noisy DTC checks, but I should've used
`git tag --contains` instead.

Fixes: cbbef976e2 ("build: dtc: Disable noisy warnings by default")
Signed-off-by: Petr Štetiar <ynezz@true.cz>

include/image.mk

@@ -154,10 +154,10 @@ endif
 
 
 # Disable noisy checks by default as in upstream
-ifeq ($(strip $(call kernel_patchver_ge,4.6.0)),1)
+ifeq ($(strip $(call kernel_patchver_ge,4.7.0)),1)
   DTC_FLAGS += -Wno-unit_address_vs_reg
 endif
-ifeq ($(strip $(call kernel_patchver_ge,4.11.0)),1)
+ifeq ($(strip $(call kernel_patchver_ge,4.12.0)),1)
   DTC_FLAGS += \
 	-Wno-unit_address_vs_reg \
 	-Wno-simple_bus_reg \
@@ -166,12 +166,12 @@ ifeq ($(strip $(call kernel_patchver_ge,4.11.0)),1)
 	-Wno-pci_device_bus_num \
 	-Wno-pci_device_reg
 endif
-ifeq ($(strip $(call kernel_patchver_ge,4.16.0)),1)
+ifeq ($(strip $(call kernel_patchver_ge,4.17.0)),1)
   DTC_FLAGS += \
 	-Wno-avoid_unnecessary_addr_size \
 	-Wno-alias_paths
 endif
-ifeq ($(strip $(call kernel_patchver_ge,4.17.0)),1)
+ifeq ($(strip $(call kernel_patchver_ge,4.18.0)),1)
   DTC_FLAGS += \
 	-Wno-graph_child_address \
 	-Wno-graph_port \