ext: stm32cube: update stm32f4xx cube version

Update Cube version for STM32F4XX family
from version: V1.14.0
to version: V1.15.0

Add support for Low Level API on stm32f4 familly

Change-Id: I459b61f011ffbc2cc265f58cd3f0be8b77155fc2
Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
211 files changed