mb/google/herobrine: Enable early eMMC init in coreboot

Move eMMC init from depthcharge into coreboot to remove it from the
critical boot path.  Doing so saves us almost 35ms on villager:
before change:
    finished storage device initialization            50,783
after change:
    finished storage device initialization            16,255

BUG=b:254092907,b:218406702
BRANCH=None
TEST=flash new FW onto villager and make sure can boot from eMMC

Change-Id: I1af1ec162029120332e7f531f75c3780266d322b
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71830
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

0 files changed, 0 insertions, 0 deletions