kernel-module-split: Remove extraneous call to depmod from module postinst

During rootfs construction, image.bbclass will call depmod after all the
modules are installed.  There's no need to run it from the postinst when
operating in offline root mode.

(From OE-Core rev: e8db81e4655ab7535db04aa3c8d7f9868ced6039)

Signed-off-by: Phil Blundell <pb@pbcl.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/kernel-module-split.bbclass

@@ -2,7 +2,9 @@ pkg_postinst_modules () {
 if [ -z "$D" ]; then
 	depmod -a ${KERNEL_VERSION}
 else
-	depmodwrapper -a -b $D ${KERNEL_VERSION}
+	# image.bbclass will call depmodwrapper after everything is installed,
+	# no need to do it here as well
+	:
 fi
 }