[tlgen.py] ERROR: get_s1n_if_exist hits DEVICE type (unexpected) for node: flash_ctrl

[yikim2256]

Description

connections: {
ibex_corei: ["flash_ctrl"],
ibex_cored: ["sram_ctrl", "flash_ctrl", "adc_ctrl", "dac_ctrl", "i2c_slv"],
i2c_mas: ["sram_ctrl", "flash_ctrl", "adc_ctrl", "dac_ctrl", "i2c_slv"]
},

ERROR: get_s1n_if_exist hits DEVICE type (unexpected)

If only one device in the connections, the aforementioned ERROR occurs.

[msfschaffner]

This is a duplicate and is already tracked here #2337.
We will likely be able to fix this soon.