RPC: Fix NRF RPC build (#14720)
RPC: Fix NRF RPC build (#14720)

RPCs not currently working on NRF, this appears to be an issue with
the compile time flags not propagating to the pigweed modules for
Zephyr.

This fixes it for now to unblock testing while I continue to investigate
a better solution.
project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip