clocksource: dw_apb_timer: removed sched_quirks variable

sched_quirks is not set with the correct quirks content and therefore
does not set the correct offset on 64 bit counters.
Variable exchanged by quirks and sched_quirks removed.
clocksource: dw_apb_timer: corrected preset of freerunning 64 bit counters

It is unclear for now if 64 bit counter width is support by the rest of
the system. For now I preset the higher 32 bits to 0 to keep
compatibility to current code.
clocksource: dw_apb_timer: fixed missing tilde in setting APBTMR_CONTROL_INT
clocksource: dw_apb_timer: added quirk for inverted timer mode handling

Some variants of SOCs using dw_apb_timer havee inverted logic for the
bit that sets one-shot / periodic mode or free running timer. This
commit adds the new APBTMR_QUIRK_INVERSE_PERIODIC.
clocksource: dw_apb_timer: implemented handling of timer mode quirk

This patch adds the handling of the new APBTMR_QUIRK_INVERSE_PERIODIC
quirk.