soc/mediatek/mt8192: revert local blobs

The files in chromium blobs repo have been diverged from upstream.
We want to revert local version and sync again from coreboot.

Revert:
 9082f7 soc/mediatek/mt8192: Add 4266Mbps flag for dpm & dram blob
 96ae35 soc/mediatek/mt8192: Add dram.elf for DRAM full calibration
 b00d58 soc/mediatek/mt8192: add spmfw binary
 86e4fd soc/mediatek/mt8192: Add dpm binary
 dda00e soc/mediatek/mt8192: Add mcupm binary

BUG=None
TEST=None

Change-Id: Ibbbacc44ecb42fa7decd496626bdaa609bec717a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/blobs/+/2741772
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Yu-Ping Wu <yupingso@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
Auto-Submit: Hung-Te Lin <hungte@chromium.org>
10 files changed