soc/intel/apollolake: use arch_segment_loaded() for CAR code coherency

Instead of using platform_prog_run() for flushing programs
from L1D to L2 for code coherency purposes use arch_segment_loaded()
instead as that it's primary purpose. The arch_segment_loaded()
is called within the infrastructure at the appropriate places when
loading programs. Therefore use that to perform the L1D flush
instead of when something is just about to run.

Change-Id: Ib0a6be6f676dcf2c946ef5702471af65d89133e9
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/14212
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Andrey Petrov <andrey.petrov@intel.com>

src/soc/intel/apollolake/car.c

@@ -26,8 +26,9 @@ static void flush_l1d_to_l2(void)
 	wrmsr(MSR_POWER_MISC, msr);
 }
 
-void platform_prog_run(struct prog *prog)
+void arch_segment_loaded(uintptr_t start, size_t size, int flags)
 {
-	/* Flush L1D cache to L2 */
+	/* Flush L1D cache to L2 on final segment loaded */
+	if (flags & SEG_FINAL)
 		flush_l1d_to_l2();
 }