ata: sata_fsl: add compile test support

Add dependendy on COMPILE_TEST to allow compile tests with configs that
do not enable FSL_SOC.

Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index f6e943c..af6bf1b 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -273,7 +273,7 @@
 
 config SATA_FSL
 	tristate "Freescale 3.0Gbps SATA support"
-	depends on FSL_SOC
+	depends on FSL_SOC || COMPILE_TEST
 	select SATA_HOST
 	help
 	  This option enables support for Freescale 3.0Gbps SATA controller.