[uaccess] Remove redundant copy_from_user() and copy_to_user()

Remove the now-redundant copy_from_user() and copy_to_user() wrapper
functions.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/usr/imgarchive.c

@@ -24,6 +24,7 @@
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdio.h>
+#include <string.h>
 #include <ipxe/image.h>
 #include <usr/imgarchive.h>
 

src/usr/imgmgmt.c

@@ -26,6 +26,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #include <stdint.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 #include <errno.h>
 #include <ipxe/image.h>
 #include <ipxe/downloader.h>

src/usr/imgtrust.c

@@ -24,6 +24,7 @@
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 #include <time.h>
 #include <syslog.h>