soc: qcom: wcnss_ctrl: Avoid string overflow

'chinfo.name' is used as a NUL-terminated string, but using strncpy() with
the length equal to the buffer size may result in lack of the termination:

drivers//soc/qcom/wcnss_ctrl.c: In function 'qcom_wcnss_open_channel':
drivers//soc/qcom/wcnss_ctrl.c:284:2: warning: 'strncpy' specified bound 32 equals destination size [-Wstringop-truncation]
  strncpy(chinfo.name, name, sizeof(chinfo.name));
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This changes it to use the safer strscpy() instead.

Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>