vpmadt032: Create .o.cmd file for the shipped object file.

Kernel version 5.8, in commit "modpost: use read_text_file() and
get_line() for reading text files" [1] made it an error if the .o.cmd
file is missing. However, this file is not generated for shipped .o
files.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=70f30cfe5b892fcb7f98e7df72ed6ccfe3225628

Signed-off-by: Shaun Ruffell <sruffell@sruffell.net>

drivers/dahdi/Kbuild

@@ -127,6 +127,7 @@ dahdi_vpmadt032_loader-objs := vpmadt032_loader/dahdi_vpmadt032_loader.o
 
 ifneq ($(DAHDI_ARCH),)
   ifneq ($(wildcard $(src)/vpmadt032_loader/vpmadt032_$(DAHDI_ARCH).o_shipped),)
+    $(shell touch $(KBUILD_EXTMOD)/vpmadt032_loader/.vpmadt032_$(DAHDI_ARCH).o.cmd)
     VPMADT032_LOADER_PRESENT=yes
     dahdi_vpmadt032_loader-objs += vpmadt032_loader/vpmadt032_$(DAHDI_ARCH).o
     obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_VPMADT032_LOADER)	+= dahdi_vpmadt032_loader.o