staging: fsl-mc: dpio: remove foolish -Werror Makefile addtion

With the zillion different compilers out there, never use -Werror,
otherwise your code will end up breaking the build for odd reasons.

Like now, if this driver is enabled, it breaks the build due to a
function that could be marked static.  So it's obvious no one is even
paying attention to this driver :(

Cc: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-mc/bus/dpio/Makefile

@@ -3,8 +3,6 @@
 # QorIQ DPAA2 DPIO driver
 #
 
-subdir-ccflags-y := -Werror
-
 obj-$(CONFIG_FSL_MC_DPIO) += fsl-mc-dpio.o
 
 fsl-mc-dpio-objs := dpio.o qbman-portal.o dpio-service.o dpio-driver.o