soc: esp32c3: add systimer clock disable option

When both MCUBoot and application run, systimer is initialized twice.
As a consequence, application freezes as systimer new initialization
conflicts with previous.

This PR adds the systimer clock disable function, that shall be called
before mcuboot jump to application, making sure it will
work as expected.

Fixes #74189

Signed-off-by: Sylvio Alves <sylvio.alves@espressif.com>