configs/solidrun_macchiatobin_mainline: bump kernel and U-Boot

configs/solidrun_macchiatobin_mainline: bump kernel and U-Boot

Bump U-Boot to version 2018.11. This version supports autodetection of
SD/eMMC boot source, so we can now enable environment load from SD card.
Add a U-Boot kconfig fragment that sets SD/eMMC as environment load/save
device. This avoids stale environment values from the SPI flash. That in
turn, allows to use the more convenient distro boot which is enabled in
the default environment.

Bump kernel to version 4.19.2. This version enables
CONFIG_PHY_MVEBU_CP110_COMPHY in the arm64 defconfig, so remove it from
the kernel kconfig fragment. Enable support for SFP modules detection
and configuration. Leave the PHY drivers for now to keep them built into
the kernel. The kernel defconfig builds these drivers as modules. But
that does not work as expected in the default configuration.

Cc: Sergey Matyukevich <geomatsi@gmail.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Tested-by: Sergey Matyukevich <geomatsi@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>