Revert "3G modem support (from branch tomato-shibby)"

This reverts commit 7666fe7d6c383530054c1462a8a587d8b700ae5f.

Conflicts:
	release/src/router/httpd/tomato.c
	release/src/router/others/switch3g
	release/src/router/rc/wan.c
	release/src/router/www/basic-network.asp
	release/src/router/www/nas-usb.asp