config/rpi: bump kernel

Misc fixes and enhancements:
  - faster image blitting in framebuffer
  - USB fixes, and use of FIQ instead of plain IRQ
  - generic ARM fixes for memset
  - BT l2cap fix

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>