staging: rtl8723bs: replace msleep() with fsleep() in rtw_cmd.c

staging: rtl8723bs: replace msleep() with fsleep() in rtw_cmd.c

Replace msleep() with fsleep() in rtw_cmd.c to improve delay
precision and follow modern kernel practices.

Specifically, this fixes a checkpatch warning for the 10ms delay
in _rtw_free_evt_priv() and updates the 100ms polling loops in
rtw_chk_hi_queue_hdl() and rtw_free_cmd_priv() for consistency.

Signed-off-by: Jose A. Perez de Azpillaga <azpijr@gmail.com>
Reviewed-by: Ethan Tidmore <ethantidmore06@gmail.com>
Link: https://patch.msgid.link/20260227084623.209913-1-azpijr@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>