rpmsg: smd: fix dependency on QCOM_SMD=n

The ARM allmodconfig build broke with the addition of the SMD rpmsg
driver that conflicts with the driver its replaces:

WARNING: drivers/soc/qcom/smd: 'qcom_smd_register_edge' exported twice. Previous export was in drivers/rpmsg/qcom_smd.ko
WARNING: drivers/soc/qcom/smd: 'qcom_smd_unregister_edge' exported twice. Previous export was in drivers/rpmsg/qcom_smd.ko

There is already a dependency that is meant to avoid the broken
configuration, but that only prevents the case where at least
one of the two are built-in, but not if both are modules.

This changes the dependency to "=n", to ensure that the new driver
can only be enabled if the other one is completely disabled.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 53e2822 ("rpmsg: Introduce Qualcomm SMD backend")
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/rpmsg/Kconfig

@@ -7,7 +7,7 @@ config RPMSG
 config RPMSG_QCOM_SMD
 	tristate "Qualcomm Shared Memory Driver (SMD)"
 	depends on QCOM_SMEM
-	depends on !QCOM_SMD
+	depends on QCOM_SMD=n
 	select RPMSG
 	help
 	  Say y here to enable support for the Qualcomm Shared Memory Driver