imx: syscounter: support timer_get_boot_us

With supporting timer_get_boot_us, we can profile boot up time with below
configs and function bootstage_mark_name().

CONFIG_BOOTSTAGE=y
CONFIG_BOOTSTAGE_REPORT=y
CONFIG_CMD_BOOTSTAGE=y

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Fabio Estevam <festevam@denx.de>
1 file changed