platform/chrome: Prevent build for big-endian systems

Both ARM and ARM64 which are a dependency for CHROME_PLATFORMS have
seldomly used big-endian variants.

The ChromeOS EC framework and drivers are written under the assumption
that they will be running on a little-endian systems. Code which would
be broken on big-endian can be found trivially.

Some examples:
cros_ec.c: suspend_params.sleep_timeout_ms = ec_dev->suspend_timeout_ms
cros_ec_debugfs.c: resp->time_since_ec_boot_ms
cros_ec_wdt.c: arg.req.reboot_timeout_sec = wdd->timeout

Prevent the build for big-endian systems.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20260531-cros-big-endian-v1-2-0cc90f39c636@weissschuh.net
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>

Author: t-8ch

drivers/platform/chrome/Kconfig

@@ -6,6 +6,7 @@
 menuconfig CHROME_PLATFORMS
 	bool "Platform support for Chrome hardware"
 	depends on X86 || ARM || ARM64 || COMPILE_TEST
+	depends on !CPU_BIG_ENDIAN || COMPILE_TEST
 	help
 	  Say Y here to get to see options for platform support for
 	  various Chromebooks and Chromeboxes. This option alone does