ARM: mach-shmobile: Enable TMU driver build

Allow users to build the TMU driver on SH-Mobile ARM.
Signed-off-by: NMagnus Damm <damm@opensource.se>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/arm/mach-shmobile/Kconfig

@@ -76,6 +76,12 @@ config SH_TIMER_CMT
 	help
 	  This enables build of the CMT timer driver.
 
+config SH_TIMER_TMU
+	bool "TMU timer driver"
+	default y
+	help
+	  This enables build of the TMU timer driver.
+
 endmenu
 
 endif