{cpu,soc}/intel: remove unused smm_init() function

There used to be a need for an empty smm_init() function
because initialize_cpus() called it even though nothing
called initialize_cpus(). However, garbage collection at
link time is implemented so there's no reason to provide an
empty function to satisfy a symbol that is completely culled
during link. Remove it.

Change-Id: Ic13c85f1d3d57e38e7132e4289a98a95829f765a
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/14605
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@google.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/baytrail/placeholders.c

@@ -17,8 +17,5 @@
 #include <device/pci_rom.h>
 #include <soc/acpi.h>
 
-
-void smm_init(void) {}
-
 /* Rmodules don't like weak symbols. */
 u32 map_oprom_vendev(u32 vendev) { return vendev; }