xtensa: xtfpga: fix section mismatch

platform_calibrate_ccount() calls update_clock_frequency() which is in .init
section. However, platform_calibrate_ccount() itself is only called from .init
(i.e., time_init()).
Signed-off-by: NBaruch Siach <baruch@tkos.co.il>
Signed-off-by: NMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: NChris Zankel <chris@zankel.net>

arch/xtensa/platforms/xtfpga/setup.c

@@ -163,7 +163,7 @@ void platform_heartbeat(void)
 
 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
 
-void platform_calibrate_ccount(void)
+void __init platform_calibrate_ccount(void)
 {
 	long clk_freq = 0;
 #ifdef CONFIG_OF