[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/image/der.c

@@ -24,6 +24,7 @@
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 #include <assert.h>
 #include <ipxe/asn1.h>

src/image/efi_image.c

@@ -21,6 +21,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 
 #include <errno.h>
 #include <stdlib.h>
+#include <string.h>
 #include <wchar.h>
 #include <ipxe/efi/efi.h>
 #include <ipxe/efi/efi_snp.h>

src/image/efi_siglist.c

@@ -30,6 +30,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
  */
 
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 #include <ipxe/asn1.h>
 #include <ipxe/der.h>

src/image/elf.c

@@ -33,6 +33,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
  * common ELF-related functionality.
  */
 
+#include <string.h>
 #include <errno.h>
 #include <elf.h>
 #include <ipxe/segment.h>

src/image/pnm.c

@@ -30,6 +30,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
  */
 
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
 #include <ctype.h>
 #include <ipxe/image.h>

src/image/segment.c

@@ -30,6 +30,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
  *
  */
 
+#include <string.h>
 #include <errno.h>
 #include <ipxe/uaccess.h>
 #include <ipxe/io.h>