configs/raspberrypi3: properly update kernel Git commit

configs/raspberrypi3: properly update kernel Git commit

In commit ed02414e9cd271c0b0db26b8d5db1bf40ff416d3
("configs/raspberrypi*: bump kernel version to 5eeff139ea"), which
updated all RaspberryPi defconfigs to use Linux 4.19,
raspberrypi3_defconfig had its
BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_19 option updated, but not the
BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION, which still pointed to an
older Linux 4.14-based RPi kernel. This caused a build failure due to
the headers being more recent than the actual kernel being built.

This commit fixes that by using the same kernel version as all other
RPi defconfigs.

Fixes:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/199339559

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>