intc: esp32c3: use source as interrupt value

Using IRQ as source for interrupt values can
fail when installing irq_connect_dynamic, as
IRQ can previously be enabled. This updates
the logic to use source map and allows
default irq_enable() and irq_disable() to call
esp32c3 interrupt allocator implementation.

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