sysutils/u-boot: Update to 2018.11

Tested-On: RPI*
Tested-On: OrangePi One
Tested-On: Pine*

sysutils/u-boot-pinebook: Update to latest upstream patches

All those patches have been merged upstream but have not made into the
latest u-boot release, add them here as they have bugfixes and hardware support
improvement.

Approved by: bapt (mentor)
Differential Revision: https://reviews.freebsd.org/D18312, https://reviews.freebsd.org/D18314