support/kconfig: upgrade to 3.9-rc2

Our kconfig code is updated to the version of kernel 3.9-rc2. No major
issues during the migration, except:

 * Some conflicts when applying 03-change-config-option-prefix.patch
   due to upstream kernel changes.

 * The need of adding a new patch, 15-fix-qconf-moc-rule.patch, to fix
   the make rule that generates the moc file for the Qt-based
   interface.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Tested-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>