staging: wilc1000: remove typedef from tstrStatistics

This patch removes typedef from the struct tstrStatistics and
rename it to rf_info.

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