Update clock_control drivers to use DT_HAS_<compat>_ENABLED Kconfig
symbol to expose the driver and enable it by default based on
devicetree.
We remove 'depend on' Kconfig for symbols that would be implied by
the devicetree node existing.
Signed-off-by: Kumar Gala <galak@kernel.org>
Simple driver that allows one to choose the clock speed of xtensa cores.
It's basically a shim layer on top of SOC level driver.
Also, a really simple test case was added, mainly to ensure things are
build and are sane.
Signed-off-by: Ederson de Souza <ederson.desouza@intel.com>