ARM: s3c: Use strscpy to replace strlcpy

The strlcpy should not be used because it doesn't limit the source
length.  Preferred is strscpy.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Link: https://lore.kernel.org/r/20210906134656.101088-1-wangborong@cdjrlc.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>