h8300: fix PREEMPTION build, TI_PRE_COUNT undefined

Fix a build error for undefined 'TI_PRE_COUNT' by adding it to
asm-offsets.c.

h8300-linux-ld: arch/h8300/kernel/entry.o: in function `resume_kernel': (.text+0x29a): undefined reference to `TI_PRE_COUNT'

Link: https://lkml.kernel.org/r/[e-mail]
Fixes: df2078b8daa7 ("h8300: Low level entry")
Signed-off-by: Randy Dunlap <[e-mail]>
Reported-by: kernel test robot <[e-mail]>
Cc: Yoshinori Sato <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/h8300/kernel/asm-offsets.c

···
 	OFFSET(TI_FLAGS, thread_info, flags);
 	OFFSET(TI_CPU, thread_info, cpu);
 	OFFSET(TI_PRE, thread_info, preempt_count);
+#ifdef CONFIG_PREEMPTION
+	DEFINE(TI_PRE_COUNT, offsetof(struct thread_info, preempt_count));
+#endif
 
 	return 0;
 }