usb: include <asm/cache.h> and <part.h> from include/usb.h

The header file include/usb.h references ARCH_DMA_MINALIGH and
block_dev_desc_t, thus it must include <asm/cache.h> and <part.h>.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

include/usb.h

@@ -11,6 +11,8 @@
 
 #include <usb_defs.h>
 #include <linux/usb/ch9.h>
+#include <asm/cache.h>
+#include <part.h>
 
 /*
  * The EHCI spec says that we must align to at least 32 bytes.  However,