power: reset: POWER_RESET_TORADEX_EC should depend on ARCH_MXC

The Toradex Embedded Controller is currently only present on Toradex
SMARC iMX8MP and iMX95 SoMs.  Hence add a dependency on ARCH_MXC, to
prevent asking the user about this driver when configuring a kernel
without NXP i.MX SoC family support.

Fixes: 18672fe ("power: reset: add Toradex Embedded Controller")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/1ef0beb1e09bf914650f9f9885a33af06772540d.1746536287.git.geert+renesas@glider.be
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Author: geertu

drivers/power/reset/Kconfig

@@ -218,6 +218,7 @@ config POWER_RESET_ST
 
 config POWER_RESET_TORADEX_EC
 	tristate "Toradex Embedded Controller power-off and reset driver"
+	depends on ARCH_MXC || COMPILE_TEST
 	depends on I2C
 	select REGMAP_I2C
 	help