linux-hikey: update to RPK 4.9 + git commit 11f2cb2
linux-hikey: update to RPK 4.9 + git commit 11f2cb2

Update PV as well to reflect it's based on linux 4.9

Signed-off-by: Fathi Boudra <7cd6e55cc07a66bc71d7901a4cddfe6c22aab659@linaro.org>

kraj/meta-96boards,mrchapp/meta-96boards,96boards/meta-96boards,fboudra/meta-96boards,kraj/meta-96boards