staging: wilc1000: removes linux_wlan_common.h file

This patch removes linux_wlan_common.h file and also removes the following
preprocessor at files that include it:
 - #include 'linux_wlan_common.h'

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