sdm845: add common sdm845 lunch target

This target builds a "generic" sdm845 device which should boot on all
SDM845 devices with common boot, vendor and system images.
diff --git a/build/tasks/kernel.mk b/build/tasks/kernel.mk
index 74baaf7..052562c 100644
--- a/build/tasks/kernel.mk
+++ b/build/tasks/kernel.mk
@@ -1,7 +1,7 @@
-ifneq ($(filter enchilada, $(TARGET_DEVICE)),)
+ifneq ($(filter enchilada beryllium sdm845, $(TARGET_DEVICE)),)
 
 IMAGE_GZ := device/generic/sdm845/prebuilt-kernel/android-$(TARGET_KERNEL_USE)/Image.gz
-DTB := device/generic/sdm845/prebuilt-kernel/android-$(TARGET_KERNEL_USE)/sdm845-oneplus-enchilada.dtb
+DTB := $(wildcard device/generic/sdm845/prebuilt-kernel/android-$(TARGET_KERNEL_USE)/*.dtb)
 
 $(PRODUCT_OUT)/kernel: $(IMAGE_GZ) $(DTB)
 	cat $(IMAGE_GZ) $(DTB) > $@