xtensa: Couple of typo fixes

s/contans/contains/
s/desination/destination/

Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Message-Id: <20210325040832.26018-1-unixbhaskar@gmail.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>