pinctrl: equilibrium: Add architecture dependency

The Equilibrium pin controller is only present on Intel Lightning
Mountain SoCs.  Add an architecture dependency to the
PINCTRL_EQUILIBRIUM config symbol, to avoid asking the user about it
when configuring a kernel for a non-x86 architecture.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200507113626.24026-2-geert+renesas@glider.beSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/Kconfig

@@ -442,6 +442,7 @@ config PINCTRL_TB10X
 config PINCTRL_EQUILIBRIUM
 	tristate "Generic pinctrl and GPIO driver for Intel Lightning Mountain SoC"
 	depends on OF && HAS_IOMEM
+	depends on X86 || COMPILE_TEST
 	select PINMUX
 	select PINCONF
 	select GPIOLIB