irqchip/apple-aic: APPLE_AIC should depend on ARCH_APPLE

The Apple Interrupt Controller is only present on Apple Silicon SoCs.
Hence add a dependency on ARCH_APPLE, to prevent asking the user about
this driver when configuring a kernel without Apple Silicon SoC support.

Drop the default, as ARCH_APPLE already selects APPLE_AIC.

Fixes: 76cde263

 ("irqchip/apple-aic: Add support for the Apple Interrupt Controller")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/f37e8daea37d50651d2164b0b3dad90780188548.1618316398.git.geert+renesas@glider.be