sh: dma: Kill off bogus dma_sysclass symbol export.

This is a static symbol, so the export is wholly superfluous. Recent
kbuild updates flagged this as an error, resulting in build failure,
so this tidies that up.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/drivers/dma/dma-sysfs.c

@@ -13,7 +13,6 @@
 #include <linux/init.h>
 #include <linux/sysdev.h>
 #include <linux/platform_device.h>
-#include <linux/module.h>
 #include <linux/err.h>
 #include <linux/string.h>
 #include <asm/dma.h>
@@ -21,7 +20,6 @@
 static struct sysdev_class dma_sysclass = {
 	.name = "dma",
 };
-EXPORT_SYMBOL(dma_sysclass);
 
 static ssize_t dma_show_devices(struct sys_device *dev,
 				struct sysdev_attribute *attr, char *buf)