Signed PD and Unsigned PD at Runtime

SNPE now defaults to using Unsigned PD for the DSP.

To set SNPE to use Signed PD:

Net run:
    snpe-net-run .... --platform_options="unsignedPD:OFF"
C++ API :
    zdl::DlSystem::PlatformConfig platformConfig;
    platformConfig.setPlatformOptions("unsignedPD:OFF");
    zdl::SNPE::SNPEBuilder snpeBuilder;
    snpeBuilder.setPlatformConfig(platformConfig);
C API:
    Snpe_PlatformConfig_Handle_t platformConfigHandle = Snpe_PlatformConfig_Create();
    Snpe_PlatformConfig_SetPlatformOptions(platformConfigHandle, "unsignedPD:OFF");
    Snpe_SNPEBuilder_Handle_t snpeBuilderHandle = Snpe_SNPEBuilder_Create(containerHandle);
    Snpe_SNPEBuilder_SetPlatformConfig(snpeBuilderHandle, platformConfigHandle);

The skels delivered with SNPE2 are not signed. They will need to be signed by the customer to use them with a signed PD.

SNPEFactory::isRuntimeAvailable() / Snpe_Util_IsRuntimeAvailableCheckOption() performs a runtime check to determine whether signed DSP skel libraries are being used.

C++ API:
    SNPEFactory::isRuntimeAvailable(DlSystem::Runtime_t runtime, DlSystem::RuntimeCheckOption_t option,
                                                    uint32_t deviceId = 0);

C API:
    Snpe_Util_IsRuntimeAvailableCheckOption(Snpe_Runtime_t runtime,
                                Snpe_RuntimeCheckOption_t runtimeCheckOption);

    Snpe_Util_IsRuntimeAvailableCheckOptionForDevice(Snpe_Runtime_t runtime,
                                        Snpe_RuntimeCheckOption_t runtimeCheckOption,
                                        uint32_t deviceId);

SDK TYPE	UNSIGNEDPD_CHECK	NORMAL_CHECK	BASIC_CHECK
Unsigned	Pass	Fail	Fail
Signed	Fail	Pass	Pass