lib/thread,lib/hardwaremain: Lazy initialize threads

By lazy initializing the threads, if a stage doesn't use them, they will
be garbage collected.

BUG=b:179699789
TEST=Boot guybrush to the OS and verify threads worked

Suggested-by: Julius Werner <jwerner@chromium.org>
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I7208ffb5dcda63d916bc6cfdea28d92a62435da6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56532
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/lib/hardwaremain.c

@@ -456,7 +456,6 @@ void main(void)
 
 	/* Handoff sleep type from romstage. */
 	acpi_is_wakeup_s3();
-	threads_initialize();
 
 	/* Initialise GNVS early. */
 	if (CONFIG(ACPI_SOC_NVS))