staging: csr: csr_wifi_hip_unifi_signal_names: fix brackets

Fixed brackets' positions in the csr_wifi_hip_unifi_signal_names.c file
that were identified by checkpatch.pl tool.  Some brackets are removed
which are not needed by the rule of CodingStyle documentation.

Signed-off-by: Hojung Youn <amoc.yn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>