Rework CMAC sleep calculations#3049
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We should calculate XTALRDY value assuming worst case which is the max possible RC32M frequency (32.6 MHz). If the actual frequency of RC32M is lower than 32.6 MHz, it will take longer time than set to mark xtal as settled which is still ok since we don't want xtal to be "settled" to early.
This adds helper to calculate number of lpclk ticks required for wakeup, i.e. wakeup fsm + xtal32m settle time. This can be then used to adjust sleep time.
In case RCX is enabled, we call lpclk enable from sysinit instead of system init.
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Sleep time calculation on CMAC assumed incorrectly that wakeup fsm uses lpclk but in fact RC32K is used so we need to take it into account. To make things easier to handle on CMAC side we will calculate wakeup time on M33 side and pass it to CMAC instead of XTAL32M settle time. This way we don't really need to care about how wakeup fsm is configured. It's now expected that M33 will take care of RC32K calibration and will calculate proper wakeup time based on wakeup fsm settings and XTAL32M settle time, and then notify CMAC on any change so we can recalculate our min sleep time.
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