grpc-blobs: SRCREV bump 1ecca35..9bc8ab0

gBMC Team (1):
      baremetal callback: Add support for gbmc-bare-metal-prep target

Tested:
- Set bare metal flag /var/google/config-package/enable-bm.flag
- Power cycled the machine
- Set the bare metal instance info
  - echo 1 > /run/bm-instance/asset-tag1
  - echo 2 > /run/bm-instance/board-serial-number1
  - echo 3 > /run/bm-instance/family1
  - echo 4 > /run/bm-instance/product-name1
  - echo 5 > /run/bm-instance/sku1
  - echo 6 > /run/bm-instance/system-serial-number1
  - echo 000102030405060708090a0b0c0d0e0f > uuid1
- Issue Redfish command to boot the guest OS
- Confirmed that the BMC received LinuxBootDone, waited for the
  connection to the host to stop working, then disabled the ethernet
  connection.

No fusion2 link for the relevant platforms.

Google-Bug-Id: 427805816
Change-Id: Ide19319f7fbd7d6c2784f96143f21aec4a3d4ed9
Signed-off-by: John Wedig <johnwedig@google.com>