git: don't use review.coreboot.org as mainHEADmaster

where backup links are available, use those as main instead.

this is because of the new XBMK_CACHE_MIRROR variable, which
makes --mirror be used

when performed on review.coreboot.org, this also pulls down
all changes from gerrit code review; the github backups for
example only contain the official branches, but gerrit creates
a new ref per merge request.

a user can still run ./mk -F to force pulling all repos,
including the coreboot.org ones, but use of -f will skip the
coreboot.org ones if the backup links worked and contain the
local commit needed, by a given project used in xbmk.

this patch won't change any real-world behaviour for xbmk
users, but it is done as a courtesy to the coreboot project,
in that it largely avoids a sudden surge in coreboot.org's
traffic if lots of users start doing XBMK_CACHE_MIRROR=y

if XBMK_CACHE_MIRROR is not set, or set to anything other
than y, a regular clone is performed, saving cached sources
to cache/clone/ - otherwise, cache/mirror/ is used.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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