ARM defconfigs: add missing inclusions of linux/platform_device.h

Patch 16559ae "kgdb: remove #include <linux/serial_8250.h> from kgdb.h"
removed an implicit inclusion of linux/platform_device.h
In a number of places. This adds back explicit inclusions in a few
more places I found.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/include/linux/platform_data/s3c-hsotg.h b/include/linux/platform_data/s3c-hsotg.h
index 8b79e09..3f1cbf9 100644
--- a/include/linux/platform_data/s3c-hsotg.h
+++ b/include/linux/platform_data/s3c-hsotg.h
@@ -15,6 +15,8 @@
 #ifndef __LINUX_USB_S3C_HSOTG_H
 #define __LINUX_USB_S3C_HSOTG_H
 
+struct platform_device;
+
 enum s3c_hsotg_dmamode {
 	S3C_HSOTG_DMA_NONE,	/* do not use DMA at-all */
 	S3C_HSOTG_DMA_ONLY,	/* always use DMA */