sh: tmu: Zap get_tbclk and timer_read_counter

Replace those two functions with generic ones by defining the
timer macros in include/config/*.h .

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
diff --git a/arch/sh/include/asm/config.h b/arch/sh/include/asm/config.h
index bad0026..d2862df 100644
--- a/arch/sh/include/asm/config.h
+++ b/arch/sh/include/asm/config.h
@@ -6,4 +6,13 @@
 #ifndef _ASM_CONFIG_H_
 #define _ASM_CONFIG_H_
 
+#if !defined(CONFIG_CPU_SH2)
+#include <asm/processor.h>
+
+/* Timer */
+#define CONFIG_SYS_TIMER_COUNTS_DOWN
+#define CONFIG_SYS_TIMER_COUNTER	(TMU_BASE + 0x8)	/* TCNT0 */
+#define CONFIG_SYS_TIMER_RATE		(CONFIG_SYS_CLK_FREQ / 4)
+#endif
+
 #endif