cleanup: platform: imx8: remove redundant calls in platform_init()

XTOS is no longer supported on imx8. As a consequence,
some calls from imx8's platform_init() have become
redundant. Remove these calls/initializations as well
as those who are redundant because of some configurations
that are not enabled (e.g: `CONFIG_TRACE`, or `CONFIG_HAVE_AGENT`).

This is a followup for thesofproject#8863.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>

Author: LaurentiuM1234

src/platform/imx8/platform.c

@@ -155,12 +155,6 @@ int platform_init(struct sof *sof)
 {
 	int ret;
 
-#ifndef __ZEPHYR__
-	sof->platform_timer = platform_shared_get(&timer_shared, sizeof(timer_shared));
-	sof->cpu_timers = sof->platform_timer;
-#endif
-
-	platform_interrupt_init();
 	platform_clock_init(sof);
 	scheduler_init_edf();
 
@@ -169,12 +163,6 @@ int platform_init(struct sof *sof)
 		timer_domain_init(sof->platform_timer, PLATFORM_DEFAULT_CLOCK);
 	scheduler_init_ll(sof->platform_timer_domain);
 
-#ifndef __ZEPHYR__
-	platform_timer_start(sof->platform_timer);
-#endif
-
-	sa_init(sof, CONFIG_SYSTICK_PERIOD);
-
 	clock_set_freq(CLK_CPU(cpu_get_id()), CLK_MAX_CPU_HZ);
 
 	/* init DMA */
@@ -189,15 +177,6 @@ int platform_init(struct sof *sof)
 	if (ret < 0)
 		return -ENODEV;
 
-#if CONFIG_TRACE
-	/* Initialize DMA for Trace*/
-	trace_point(TRACE_BOOT_PLATFORM_DMA_TRACE);
-	dma_trace_init_complete(sof->dmat);
-#endif
-
-	/* show heap status */
-	heap_trace_all(1);
-
 	return 0;
 }