xtensa: add missing include asm/uaccess.h to checksum.h

This fixes the following build errors seen in the linux-next:

arch/xtensa/include/asm/checksum.h:247:2: error: implicit declaration of
function 'access_ok' [-Werror=implicit-function-declaration]
arch/xtensa/include/asm/checksum.h:247:16: error: 'VERIFY_WRITE' undeclared
(first use in this function)

Signed-off-by: Max Filippov <[e-mail]>
Signed-off-by: Chris Zankel <[e-mail]>

arch/xtensa/include/asm/checksum.h

···
 #define _XTENSA_CHECKSUM_H
 
 #include <linux/in6.h>
+#include <asm/uaccess.h>
 #include <variant/core.h>
 
 /*