Staging: kpc2000: kpc_dma: Include the preferred header.

<linux/io.h> is the preferred header to include
instead of <asm/io.h>.

Checkpatch.pl WARNING:
Use #include <linux/io.h> instead of <asm/io.h>
Signed-off-by: Sam Muhammed <jane.pnx9@gmail.com>
Link: https://lore.kernel.org/r/c7a824c3a2ddc5f44bd89504b8c03a328d69f81d.1585143581.git.jane.pnx9@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/kpc2000/kpc_dma/kpc_dma_driver.c

@@ -2,7 +2,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/types.h>
-#include <asm/io.h>
+#include <linux/io.h>
 #include <linux/export.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>