bus: vexpress-config: Add missing MODULE_DESCRIPTION() macro

With ARCH=arm64, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/bus/vexpress-config.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://lore.kernel.org/r/20240613-md-arm64-drivers-bus-v1-1-e8162434e0ca@quicinc.comSigned-off-by: Sudeep Holla <sudeep.holla@arm.com>

drivers/bus/vexpress-config.c

@@ -414,4 +414,5 @@ static struct platform_driver vexpress_syscfg_driver = {
 	.probe = vexpress_syscfg_probe,
 };
 module_platform_driver(vexpress_syscfg_driver);
+MODULE_DESCRIPTION("Versatile Express configuration bus");
 MODULE_LICENSE("GPL v2");