platform/x86: dell: Use *-y instead of *-objs in Makefile

platform/x86: dell: Use *-y instead of *-objs in Makefile

The `objs` suffix is reserved for user-space tools. Use the `y` suffix
instead, which is usually used for kernel drivers.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Kurt Borja <kuurtb@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20250214214535.4947-1-kuurtb@gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>