Get rid of final remnants of include/asm-$(ARCH)

This renames include/asm-h8300/timer.h into arch/h8300/include/asm: it
was left over just because that file had been created in the -mm tree
before the whole h8300 header subdirectory had been moved, and then got
merged in the old location afterwards.

(See commits e0b0f9e4ea: "h8300: update
timer handler - new files" and 758db3f211:
"[h8300] move include/asm-h8300 to arch/h8300/include/asm" for details).

This also removes a left-over .gitignore file in include/asm-arm that
became stale when the ARM header files were moved (which happened in
multiple commits, just see "git log -- include/asm-arm" for details).

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/h8300/include/asm/timer.h

@@ -0,0 +1,25 @@
+#ifndef __H8300_TIMER_H
+#define __H8300_TIMER_H
+
+void h8300_timer_tick(void);
+void h8300_timer_setup(void);
+void h8300_gettod(unsigned int *year, unsigned int *mon, unsigned int *day,
+		   unsigned int *hour, unsigned int *min, unsigned int *sec);
+
+#define TIMER_FREQ (CONFIG_CPU_CLOCK*10000) /* Timer input freq. */
+
+#define calc_param(cnt, div, rate, limit)			\
+do {								\
+	cnt = TIMER_FREQ / HZ;					\
+	for (div = 0; div < ARRAY_SIZE(divide_rate); div++) {	\
+		if (rate[div] == 0)				\
+			continue;				\
+		if ((cnt / rate[div]) > limit)			\
+			break;					\
+	}							\
+	if (div == ARRAY_SIZE(divide_rate))			\
+		panic("Timer counter overflow");		\
+	cnt /= divide_rate[div];				\
+} while(0)
+
+#endif