armhf: Update linux debian image file name

For armhf "unsigned" is not appened to the linux-image file name
Hence removed it from the target name

Testing:
 - Checked linux image debian is copied properly after sucessful
   build

Makefile

@@ -12,7 +12,11 @@ CONFIGURED_ARCH ?= amd64
 
 LINUX_HEADER_COMMON = linux-headers-$(KVERSION_SHORT)-common_$(KERNEL_VERSION)-$(KERNEL_SUBVERSION)_all.deb
 LINUX_HEADER_AMD64 = linux-headers-$(KVERSION)_$(KERNEL_VERSION)-$(KERNEL_SUBVERSION)_$(CONFIGURED_ARCH).deb
-LINUX_IMAGE = linux-image-$(KVERSION)-unsigned_$(KERNEL_VERSION)-$(KERNEL_SUBVERSION)_$(CONFIGURED_ARCH).deb
+ifeq ($(CONFIGURED_ARCH), armhf)
+	LINUX_IMAGE = linux-image-$(KVERSION)_$(KERNEL_VERSION)-$(KERNEL_SUBVERSION)_$(CONFIGURED_ARCH).deb
+else
+	LINUX_IMAGE = linux-image-$(KVERSION)-unsigned_$(KERNEL_VERSION)-$(KERNEL_SUBVERSION)_$(CONFIGURED_ARCH).deb
+endif
 
 MAIN_TARGET = $(LINUX_HEADER_COMMON)
 DERIVED_TARGETS = $(LINUX_HEADER_AMD64) $(LINUX_IMAGE)