hw/intc/arm_gicv3: Provide ich_num_aprs()

We previously open-coded the expression for the number of virtual APR
registers and the assertion that it was not going to cause us to
overflow the cs->ich_apr[] array.  Factor this out into a new
ich_num_aprs() function, for consistency with the icc_num_aprs()
function we just added for the physical APR handling.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220512151457.3899052-7-peter.maydell@linaro.org
Message-id: 20220506162129.2896966-6-peter.maydell@linaro.org

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