[POWERPC] PS3: Fix gelic net module dependency

The PS3 gelic network driver depends on the wake-on-lan support
provided by the PS3 sys manager driver.  Add that dependency
to the GELIC_NET Kconfig option.

Prevents these build errors:

  ps3_gelic_net.c:1277: undefined reference to `.ps3_sys_manager_get_wol'
  ps3_gelic_net.c:1337: undefined reference to `.ps3_sys_manager_set_wol'

CC: Masakazu Mokuno <mokuno@sm.sony.co.jp>
CC: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>