Add Powercycle Blob recipe for drainless update This makes GBMC_POWERCYCLE_VERSION to select uboot and cpld versions during the image build. Tested: Build passed and blob is picked up in the image, image booted on machine. Google-Bug-Id: 402505598 Change-Id: I85cf90e694993ce7411c1ccca721110ff7091c25 Signed-off-by: Yuxiao Zhang <yuxiaozhang@google.com>