dimlib: use *-y instead of *-objs in Makefile

*-objs suffix is reserved rather for (user-space) host programs while
usually *-y suffix is used for kernel drivers (although *-objs works for
that purpose for now).

Let's correct the old usages of *-objs in Makefiles.

Link: https://lkml.kernel.org/r/20240821155140.611514-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Tal Gilboa <talgi@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>