MIPS: Loongson64: Drop asm/clock.h include

This include isn't used by this file, so just remove it.
Acked-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Paul Burton <paulburton@kernel.org>
Cc: <linux-mips@vger.kernel.org>
Cc: <chenhc@lemote.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lkml.kernel.org/r/20200409064416.83340-10-sboyd@kernel.orgReviewed-by: Arnd Bergmann <arnd@arndb.de>

arch/mips/loongson64/smp.c

@@ -15,7 +15,6 @@
 #include <linux/kexec.h>
 #include <asm/processor.h>
 #include <asm/time.h>
-#include <asm/clock.h>
 #include <asm/tlbflush.h>
 #include <asm/cacheflush.h>
 #include <loongson.h>