staging: rtl8712: Cleanup codestyle, break up long line

Cleanup below checkpatch issue:

WARNING:LONG_LINE: line over 80 characters
1000: FILE: rtl871x_security.c:1000:
+static void construct_ctr_preload(u8 *ctr_preload, sint a4_exists, sint qc_exists,

Signed-off-by: Neil Singh <neil2468@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>