[PATCH -next] watchdog/kempld_wdt: fix build for COMPILE_TEST

[Randy Dunlap <rdunlap@infradead.org>]

From: Randy Dunlap <rdunlap@infradead.org>

Fix kconfig dependencies when COMPILE_TEST is enabled so that
interdependent module dependencies are configured as needed.

Fixes build when MFD_KEMPLD=m and KEMPLD_WDT=y and COMPILE_TEST=y.
The problem is in mixing tristate and boolean dependencies.

This fixes 32 build errors like these (most are omitted here):
drivers/built-in.o: In function `kempld_wdt_stop':
kempld_wdt.c:(.text+0x19ab8d): undefined reference to `kempld_get_mutex'
kempld_wdt.c:(.text+0x19ab99): undefined reference to `kempld_read8'
kempld_wdt.c:(.text+0x19abaa): undefined reference to `kempld_write8'
kempld_wdt.c:(.text+0x19abbf): undefined reference to `kempld_release_mutex'
drivers/built-in.o: In function `kempld_wdt_keepalive':
kempld_wdt.c:(.text+0x19ac24): undefined reference to `kempld_release_mutex'
drivers/built-in.o: In function `kempld_wdt_set_stage_action.isra.4':
kempld_wdt.c:(.text+0x19aca1): undefined reference to `kempld_get_mutex'
drivers/built-in.o: In function `kempld_wdt_set_stage_timeout.isra.5':
kempld_wdt.c:(.text+0x19adde): undefined reference to `kempld_release_mutex'
drivers/built-in.o: In function `kempld_wdt_start':
kempld_wdt.c:(.text+0x19ae89): undefined reference to `kempld_get_mutex'
drivers/built-in.o: In function `kempld_wdt_get_timeout.isra.6':
kempld_wdt.c:(.text+0x19b01a): undefined reference to `kempld_read8'
drivers/built-in.o: In function `kempld_wdt_update_timeouts':
kempld_wdt.c:(.text+0x19b0c6): undefined reference to `kempld_get_mutex'
drivers/built-in.o: In function `kempld_wdt_suspend':
kempld_wdt.c:(.text+0x19b136): undefined reference to `kempld_release_mutex'
drivers/built-in.o: In function `kempld_wdt_probe':
kempld_wdt.c:(.text+0x19b1a4): undefined reference to `kempld_get_mutex'
kempld_wdt.c:(.text+0x19b1bd): undefined reference to `kempld_release_mutex'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Michael Brunner <michael.brunner@kontron.com>
---
 drivers/watchdog/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20170228.orig/drivers/watchdog/Kconfig
+++ linux-next-20170228/drivers/watchdog/Kconfig
@@ -1063,7 +1063,7 @@ config HP_WATCHDOG
 
 config KEMPLD_WDT
 	tristate "Kontron COM Watchdog Timer"
-	depends on MFD_KEMPLD || COMPILE_TEST
+	depends on MFD_KEMPLD || (MFD_KEMPLD=y && COMPILE_TEST)
 	select WATCHDOG_CORE
 	help
 	  Support for the PLD watchdog on some Kontron ETX and COMexpress