test: move timer mocks to the common part

Previously used by kpb tests only and defined locally.
New pieces of the code, like perf macros need them
globally.

Signed-off-by: Marcin Maka <marcin.maka@linux.intel.com>

test/cmocka/src/common_mocks.c

@@ -7,6 +7,7 @@
 
 #include <errno.h>
 #include <sof/lib/alloc.h>
+#include <sof/drivers/timer.h>
 #include <stdlib.h>
 #include <stdarg.h>
 #include <stddef.h>
@@ -85,3 +86,18 @@ void WEAK _spin_unlock_irq(spinlock_t *lock, uint32_t flags, int line)
 	(void)flags;
 	(void)line;
 }
+
+uint64_t WEAK platform_timer_get(struct timer *timer)
+{
+	(void)timer;
+
+	return 0;
+}
+
+uint64_t WEAK arch_timer_get_system(struct timer *timer)
+{
+	(void)timer;
+
+	return 0;
+}
+