manifest: Update sdk-nrf-802154 and nrfxlib revisions

This commit updates sdk-nrf-802154 and nrfxlib revisions to bring in
the latest changes in the nrf_802154 component.

Signed-off-by: Dawid Przybylo <dawid.przybylo@nordicsemi.no>

west.yml

@@ -140,7 +140,7 @@ manifest:
  - name: nrfxlib
  repo-path: sdk-nrfxlib
  path: nrfxlib
- revision: 4eca399cc6e8a095f320aafdd272606ee1294a13
+ revision: pull/1048/head
  - name: trusted-firmware-m
  repo-path: sdk-trusted-firmware-m
  path: modules/tee/tf-m/trusted-firmware-m
@@ -166,7 +166,7 @@ manifest:
  - name: nrf-802154
  repo-path: sdk-nrf-802154
  path: nrf-802154
- revision: 43a0e760e7e47589739da632f852237d6331dacf
+ revision: ec673a1d817e3ef52170ec999a33c7e633ee1e84
  groups:
  - nrf-802154
  - name: dragoon