[PATCH] fs_enet build fix

Due to the recent update of the platform code, some platform device
drivers fail to compile. This fix is for fs_enet, adding #include of a
new header, to which a number of platform stuff has been relocated.

Signed-off-by: Vitaly Bordug <vbordug@ru.mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>