cfi_protect is not implemented on Spansion flashes (many do not even have protection bits). Demote from error to warning, so that common board code can use "flash write_image erase unlock" regardless of the flash type.

Signed-off-by: Michael Schwingen <michael@schwingen.org>

src/flash/nor/cfi.c

@@ -1163,8 +1163,8 @@ static int cfi_protect(struct flash_bank *bank, int set, int first, int last)
 			return cfi_intel_protect(bank, set, first, last);
 			break;
 		default:
-			LOG_ERROR("protect: cfi primary command set %i unsupported", cfi_info->pri_id);
-			return ERROR_FAIL;
+			LOG_WARNING("protect: cfi primary command set %i unsupported", cfi_info->pri_id);
+			return ERROR_OK;
 	}
 }