ARM: configs: keystone: Enable reset drivers

Enable the TI SYSCON and TI-SCI reset drivers for Keystone
platforms. These drivers will provide the reset functionality
for devices like DSPs or PRU-ICSSs. There are no devices that
require these to be built-in, so these are enabled as modules.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>