fwgdb: Adapt to new binary names for depthcharge
fwgdb: Adapt to new binary names for depthcharge

The name and location of the depthcharge symbol file has changed, so
adapt fwgdb to look in the right place by default.  Also fix board
detection for non-EFS boards (no idea how I could overlook that in the
first place...).

CQ-DEPEND=CL:209260
BUG=chrome-os-partner:18390
TEST=Make sure it works with both Daisy and Falco.

Change-Id: Idfb1656605a147d0fc025907d0a13779a2df6b51
Signed-off-by: Julius Werner <4d12f06cff3725783b352157673a720bc67c4afe@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/209245
Reviewed-by: Aaron Durbin <af0622ab041e8b0f8e5819838dcc93898196e71f@chromium.org>

bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite