[fuchsia][sysmem2] move to sysmem2 protocols Bug: b/306258175 Cq-Include-Trybots: luci.chrome.try:fuchsia-smoke-sherlock,fuchsia-cast-sherlock,fuchsia-fyi-sherlock;luci.chromium.try:fuchsia-arm64-cast-receiver-rel,fuchsia-x64-cast-receiver-rel,fuchsia-x64-cast-receiver-dbg Change-Id: Ia15a56214bbbf4f7f7c980422f2fbc5976073011 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/56