update the 4.14 and 4.19 prebuilt kernels am: 7f0d0dcd40 am: 8b8fccd142 am: f8275c4fec am: e74de77501

Original change: https://android-review.googlesource.com/c/device/ti/beagle-x15-kernel/+/1892515

Change-Id: Iaca2b20d7f5a023d321933cc967f933814f0a55c