Ast10x0 : FMC flash backend for the flash service - #433
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Signed-off-by: Chris Frantz <cfrantz@google.com>
Signed-off-by: Chris Frantz <cfrantz@google.com>
The flash-service branch's services/flash/client.rs calls ErrorCode::check_status, which was missing from util/error on this branch; restore it so the baseline compiles.
Adds the AST10x0 flash-service test image's system config, generic kernel target, and server app (flash_server_bin). The server process owns the SCU (pinctrl), FMC register, and CS0 AHB read-window device mappings, and serves services_flash_server::FlashIpcServer requests over the "flash" channel using the Task 3 FMC backend. The client app, system_image, and tests are added by the next task.
Completes the pinmux-ownership change already present in the flash test image (system.json5 no longer maps the SCU into the server process): the backend driver no longer touches the shared SCU; PINCTRL_FMC_QUAD is applied once by the kernel target before any process starts.
…mirrors smc/write)
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This PR depends on #365
Tests
The service is exercised end-to-end through the full IPC stack (FlashIpcClient → server → BlockingFlash → Ast10x0FmcFlashDriver → FMC CS0), not just at the peripheral level.