staging: wilc1000: wilc_parse_network_info(): renames local inner variables

This patch renames to avoid camelcase, changes follow are:
 - pu8TimElm to tim_elm
 - pu8IEs to ies
 - u16IEsLen to ies_len
 - u32Tsf_Lo to tsf_lo
 - u32Tsf_Hi to tsf_hi

And, remove the prefix variable defined name, below are:
 - u8index to index
 - pu8msa to msa

Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>