clocksource: Explicitly include linux/clocksource.h when needed

The kbuild test robot reported errors in these files when doing an ia64
allmodconfig build.

drivers/clocksource/timer-sun5i.c:52:21: error: field 'clksrc' has incomplete type
   struct clocksource clksrc;
                      ^~~~~~
drivers/clocksource/cadence_ttc_timer.c:92:21: error: field 'cs' has incomplete type
   struct clocksource cs;
                      ^~

(and many more errors for these files)

Cc: Michal Simek <[email protected]>
Cc: "Sören Brinkmann" <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Chen-Yu Tsai <[email protected]>
Reported-by: kbuild test robot <[email protected]>
Signed-off-by: Stephen Rothwell <[email protected]>
Acked-by: Michal Simek <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>

Author: sfrothwell

drivers/clocksource/cadence_ttc_timer.c

@@ -18,6 +18,7 @@
 #include <linux/clk.h>
 #include <linux/interrupt.h>
 #include <linux/clockchips.h>
+#include <linux/clocksource.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/slab.h>

drivers/clocksource/timer-sun5i.c

@@ -12,6 +12,7 @@
 
 #include <linux/clk.h>
 #include <linux/clockchips.h>
+#include <linux/clocksource.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>