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/include/configs/rcar-gen2-common.h b/include/configs/rcar-gen2-common.h
index 2a5cd6b..d606da8 100644
--- a/include/configs/rcar-gen2-common.h
+++ b/include/configs/rcar-gen2-common.h
@@ -22,7 +22,6 @@
 
 #define CONFIG_ARCH_CPU_INIT
 
-#define CONFIG_TMU_TIMER
 #ifndef CONFIG_PINCTRL_PFC
 #define CONFIG_SH_GPIO_PFC
 #endif
@@ -57,4 +56,10 @@
 #undef CONFIG_SPI_FLASH_MTD
 #endif
 
+/* Timer */
+#define CONFIG_TMU_TIMER
+#define CONFIG_SYS_TIMER_COUNTS_DOWN
+#define CONFIG_SYS_TIMER_COUNTER	(TMU_BASE + 0xc)	/* TCNT0 */
+#define CONFIG_SYS_TIMER_RATE		(CONFIG_SYS_CLK_FREQ / 8)
+
 #endif	/* __RCAR_GEN2_COMMON_H */