arm64/kernel: remove duplicate include in process.c

Remove all but the first include of linux/sched.h from process.c

Reported-by: Zeal Robot <[e-mail]>
Signed-off-by: Lv Ruyi <[e-mail]>
Acked-by: Mark Rutland <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Catalin Marinas <[e-mail]>

arch/arm64/kernel/process.c

···
 #include <linux/mman.h>
 #include <linux/mm.h>
 #include <linux/nospec.h>
-#include <linux/sched.h>
 #include <linux/stddef.h>
 #include <linux/sysctl.h>
 #include <linux/unistd.h>