configs: bump kernel for raspberrypi_defconfig

Bump to the latest /stable/ linux 3.10.y for the Raspberry Pi defconfig.

Brings in quite a few bug-fixes (now based on 3.10.25), and a few
(minor) improvements (add DAC support).

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>