clocksource: sh_cmt: Set initcall level to subsys

The reason for this is to ensure that CMT is probed earlier
than with its previous initcall level, module init.

This came up as a problem with using kzm9g-reference which does
not make use of early timers or devices. In that scenario initialisation
of SDHI and MMCIF both stall on msleep() calls due to the absence
of a initialised clock source.

Boot tested on: armadillo800eva, mackerel and kzm9g
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

drivers/clocksource/sh_cmt.c

@@ -838,7 +838,7 @@ static void __exit sh_cmt_exit(void)
 }
 
 early_platform_init("earlytimer", &sh_cmt_device_driver);
-module_init(sh_cmt_init);
+subsys_initcall(sh_cmt_init);
 module_exit(sh_cmt_exit);
 
 MODULE_AUTHOR("Magnus Damm");