ODROID: i2c DT improvements

max-bus-freq matches ODROID kernel and also other 4412 boards.

sda-delay is needed for talking to RTC on PMIC, otherwise the i2c
controller never sees an ACK. Strangely the other PMIC i2c slave (the
main one) works fine even without this delay.
Value 100 matches the ODROID kernel too.
ODROID: Enable PMIC interrupts

The ODROID kernel shows that the PMIC interrupt line is hooked up
to pin GPX3-2.

This is needed for the max77686-irq driver to create the PMIC IRQ
domain, which is needed by max77686-rtc.
Fix SAMSUNG_PM_DEBUG

For some reason this depends caused the option to be hidden.
Also it wasn't compiling.