drivers: i2c: mcux_lpi2c: Support split role interrupts

Some NXP SoCs have dedicated interrupts for controller and target roles.
The i2c_mcux_lpi2c driver connects only one interrupt.
Add connection of the second interrupt, if enabled, to support SoCs with
split role interrupts.

Signed-off-by: Michal Smola <michal.smola@nxp.com>