Ensure ipmi conditional patch is applied

toolchain/kernel-headers/kernel-headers-new.makefile

@@ -60,6 +60,10 @@ $(LINUX_HEADERS_UNPACK_DIR)/.unpacked: $(DL_DIR)/$(LINUX_HEADERS_SOURCE)
 $(LINUX_HEADERS_UNPACK_DIR)/.patched: $(LINUX_HEADERS_UNPACK_DIR)/.unpacked
 	toolchain/patch-kernel.sh $(LINUX_HEADERS_UNPACK_DIR) toolchain/kernel-headers \
 		linux-$(LINUX_HEADERS_VERSION)-\*.patch{,.gz,.bz2}
+ifeq ($(BR2_KERNEL_HEADERS_IPMI),y)
+	toolchain/patch-kernel.sh $(LINUX_HEADERS_UNPACK_DIR) toolchain/kernel-headers/ipmi \
+		linux-$(LINUX_HEADERS_VERSION)-\*.patch{,.gz,.bz2}
+endif
 ifeq ($(BR2_KERNEL_HEADERS_LZMA),y)
 	toolchain/patch-kernel.sh $(LINUX_HEADERS_UNPACK_DIR) toolchain/kernel-headers/lzma \
 		linux-$(LINUX_HEADERS_VERSION)-\*.patch{,.gz,.bz2}