uboot-imx

arm: rmobile: kzm9g: Add CONFIG_GLOBAL_TIMER to board config file

kzm9g board use global timer. But by commit 813ffda31, timer function of
rmobile was changed that global timer might be used, when CONFIG_GLOBAL_TIMER
was defined.
This add CONFIG_GLOBAL_TIMER to board config file.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>