u-boot-poplar: update SRCREV
u-boot-poplar: update SRCREV

Enable fastboot support.

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

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