serial: 8250_mid: fix broken DMA dependency

BugLink: http://bugs.launchpad.net/bugs/1756866

commit 0ff42305 upstream.

In order to enable HSU DMA PCI driver, the HSU DMA Engine
must be enabled. This add a check for that.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

drivers/tty/serial/8250/Kconfig

@@ -372,7 +372,7 @@ config SERIAL_8250_MID
 	tristate "Support for serial ports on Intel MID platforms"
 	depends on SERIAL_8250 && PCI
 	select HSU_DMA if SERIAL_8250_DMA
-	select HSU_DMA_PCI if X86_INTEL_MID
+	select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID)
 	select RATIONAL
 	help
 	  Selecting this option will enable handling of the extra features