Restrict ST ASC driver to only build on !ARM when COMPILE_TEST isset.

[Dave Jones]

The Kconfig for this option suggests it's only relevant on STi SoCs,
so add depends to have it not show up on archs that won't ever run it.
 
Signed-off-by: Dave Jones <davej@xxxxxxxxxxxxxxxxx>

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index cc4c868..304a637 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1503,6 +1503,7 @@ config SERIAL_FSL_LPUART_CONSOLE
 config SERIAL_ST_ASC
 	tristate "ST ASC serial port support"
 	select SERIAL_CORE
+	depends on ARM || COMPILE_TEST
 	help
 	  This driver is for the on-chip Asychronous Serial Controller on
 	  STMicroelectronics STi SoCs.
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