loader/uboot: Move to foo.ldconfig

Move to the foo.ldconfig convention to match the rest of the boot
loader. No functional change intended.

Sponsored by: Netflix
Reviewed by: tsoome, kevans
Diffe

loader/uboot: Move to foo.ldconfig

Move to the foo.ldconfig convention to match the rest of the boot
loader. No functional change intended.

Sponsored by: Netflix
Reviewed by: tsoome, kevans
Differential Revision: https://reviews.freebsd.org/D44059

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