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Add sysutils/u-boot-rpi3-32 to build a 32-bit version of u-boot

Description

Add sysutils/u-boot-rpi3-32 to build a 32-bit version of u-boot

This is useful for using the camera hardware, as
misc/raspberrypi-userland does not support aarch64.

Approved by: imp, manu
Differential Revision: https://reviews.freebsd.org/D21603