staging: wilc1000: remove typedef from SITE_SURVEY_T

This patch remove typedef from the enum SITE_SURVEY_T.
And rename it to SITESURVEY.

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>