dt-bindings: timer: arm,arch_timer: Fix requirements for interrupt description

The arm,arch_timer DT binding is extremely imprecise in describing
the requirements for interrupts.

Follow the architecture by making it explicit that:
- the EL1 secure timer irq is required if EL3 is implemented
- the EL1 physical timer irq is always required
- the EL1 virtual timer irq is always required
- the EL2 physical timer irq is required if EL2 is implemented
- the EL2 virtual timer irq is required if FEAT_VHE is implemented

The consequence of the above is that the minimum number of interrupts
to be described is 2, and not 1.

Finally, clean up the description which made the assumption that
the timers are plugged into a GIC (unfortunately, that's not always
true), drop the MMIO nonsense that has long be moved to a separate
binding, and use the architectural terminology to describe the various
interrupts.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260523140242.586031-5-maz@kernel.org

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