clocksource/drivers/sp804: Add static for functions such as sp804_clockevents_init()

Add static for sp804_clocksource_and_sched_clock_init() and
sp804_clockevents_init(), they are only used in timer-sp804.c now.
Otherwise, the following warning will be reported:

drivers/clocksource/timer-sp804.c:68:12: warning: no previous prototype \
for 'sp804_clocksource_and_sched_clock_init' [-Wmissing-prototypes]
drivers/clocksource/timer-sp804.c:162:12: warning: no previous prototype \
for 'sp804_clockevents_init' [-Wmissing-prototypes]

Fixes: 975434f8 ("clocksource/drivers/sp804: Delete the leading "__" of some functions")
Fixes: 65f4d7dd ("clocksource/drivers/sp804: Remove unused sp804_timer_disable() and timer-sp804.h")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20201021012259.2067-2-thunder.leizhen@huawei.com

drivers/clocksource/timer-sp804.c

@@ -117,10 +117,10 @@ static u64 notrace sp804_read(void)
 	return ~readl_relaxed(sched_clkevt->value);
 }
 
-int __init sp804_clocksource_and_sched_clock_init(void __iomem *base,
-						  const char *name,
-						  struct clk *clk,
-						  int use_sched_clock)
+static int __init sp804_clocksource_and_sched_clock_init(void __iomem *base,
+							 const char *name,
+							 struct clk *clk,
+							 int use_sched_clock)
 {
 	long rate;
 	struct sp804_clkevt *clkevt;
@@ -216,8 +216,8 @@ static struct clock_event_device sp804_clockevent = {
 	.rating			= 300,
 };
 
-int __init sp804_clockevents_init(void __iomem *base, unsigned int irq,
-				  struct clk *clk, const char *name)
+static int __init sp804_clockevents_init(void __iomem *base, unsigned int irq,
+					 struct clk *clk, const char *name)
 {
 	struct clock_event_device *evt = &sp804_clockevent;
 	long rate;