bus: mhi: host: pci_generic: Add Telit FN920C04 modem support

Add SDX35 based modem Telit FN920C04.

$ lspci -vv
01:00.0 Unassigned class [ff00]: Qualcomm Device 011a
        Subsystem: Device 1c5d:2020

Signed-off-by: Daniele Palmas <dnlplm@gmail.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://patch.msgid.link/20250401093458.2953872-1-dnlplm@gmail.com