staging: fsl-mc: update Kconfig dependency

The Kconfig dependency previously included ARM64, which is not
strictly correct.  Change it to ARCH_LAYERSCAPE which is the
SoC platform that includes the DPAA2 hardware.
Signed-off-by: Stuart Yoder <stuart.yoder@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-mc/bus/Kconfig

@@ -8,7 +8,7 @@
 
 config FSL_MC_BUS
 	bool "QorIQ DPAA2 fsl-mc bus driver"
-	depends on OF && ARM64
+	depends on OF && ARCH_LAYERSCAPE
 	select GENERIC_MSI_IRQ_DOMAIN
 	help
 	  Driver to enable the bus infrastructure for the QorIQ DPAA2