Remove the fallback mechanism from rpc_service for getting device information

[shubhamdp]

Problem

We still have fallback mechanism for some configurations in rpc_server. Please check the below example for getting vendor id.

connectedhomeip/examples/common/pigweed/rpc_services/Device.h

Lines 314 to 321 in 9bde9e3

	if (DeviceLayer::GetDeviceInstanceInfoProvider()->GetVendorId(vendor_id) == CHIP_NO_ERROR)
	{
	response.vendor_id = static_cast<uint32_t>(vendor_id);
	}
	else
	{
	response.vendor_id = CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID;
	}

Proposed Solution

Please remove the fallbacks options