arm64: defconfig: select i.MX ICC and DEVFREQ

i.MX ICC and DEVFREQ driver is required for i.MX8MP normal boot,
because the BLK CTRL power domain driver requires QoS configuraton.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>