dmaengine: st_fdma: Update st_fdma to 'depends on REMOTEPROC'.

During randconfig builds you can get the following warning
"warning: (ST_FDMA) selects ST_SLIM_REMOTEPROC which has unmet direct
 dependencies (REMOTEPROC)"

randconfig builds should always build without any warnings so
update fdma to depend on REMOTEPROC so this can not happen.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/Kconfig

@@ -438,6 +438,7 @@ config STE_DMA40
 config ST_FDMA
 	tristate "ST FDMA dmaengine support"
 	depends on ARCH_STI
+	depends on REMOTEPROC
 	select ST_SLIM_REMOTEPROC
 	select DMA_ENGINE
 	select DMA_VIRTUAL_CHANNELS