redhat: automotive: remove tech preview message

JIRA: https://issues.redhat.com/browse/RHEL-77268
Upstream Status: RHEL only

For the automotive kernel, do not log a tech preview warning message for
real-time kernels.

Signed-off-by: Scott Weaver <scweaver@redhat.com>

Author: swvrrh

arch/arm64/kernel/setup.c

@@ -335,7 +335,7 @@ void __init __no_sanitize_address setup_arch(char **cmdline_p)
 
 	paging_init();
 
-	if (IS_ENABLED(CONFIG_PREEMPT_RT))
+	if (IS_ENABLED(CONFIG_PREEMPT_RT) && !IS_ENABLED(CONFIG_RH_AUTOMOTIVE))
 		mark_tech_preview("RHEL-RT on ARM64", NULL);
 
 	acpi_table_upgrade();