rtc: fsl-ftm-alarm: allow COMPILE_TEST

Allow building building the driver with COMPILE_TEST.

Link: https://lore.kernel.org/r/20200306131629.18837-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/Kconfig

@@ -1334,7 +1334,7 @@ config RTC_DRV_IMXDI
 
 config RTC_DRV_FSL_FTM_ALARM
 	tristate "Freescale FlexTimer alarm timer"
-	depends on ARCH_LAYERSCAPE || SOC_LS1021A
+	depends on ARCH_LAYERSCAPE || SOC_LS1021A || COMPILE_TEST
 	help
 	   For the FlexTimer in LS1012A, LS1021A, LS1028A, LS1043A, LS1046A,
 	   LS1088A, LS208xA, we can use FTM as the wakeup source.