Input: apple_z2 - fix potential confusion in Kconfig

Add a dependency on ARCH_APPLE and clarify the description to make it
more obvious that this is for ARM machines, not x86 ones.

Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
Link: https://lore.kernel.org/r/20250225-z2-kconfig-v1-1-a67d9b778a6c@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Author: WhatAmISupposedToPutHere

drivers/input/touchscreen/Kconfig

@@ -106,9 +106,9 @@ config TOUCHSCREEN_ADC
 config TOUCHSCREEN_APPLE_Z2
 	tristate "Apple Z2 touchscreens"
 	default ARCH_APPLE
-	depends on SPI
+	depends on SPI && (ARCH_APPLE || COMPILE_TEST)
 	help
-	  Say Y here if you have an Apple device with
+	  Say Y here if you have an ARM Apple device with
 	  a touchscreen or a touchbar.
 
 	  If unsure, say N.