ecpmulti for um-85k

[emard]

For ULX4M prototype, I was porting
DFU bootloader for had-2019 badge
https://github.com/emard/had2019-playground

Onboard chip is um-85k device ID 0x01113043
and "ecpmulti" needs to be used to make a bootloader
which starts from 0 and by pulling PROGRAMN down
jumps to user bitstream at 0x200000

Although building as um-85k, bootloader itself started
but was unable to jump to user bitstream and also
prevent to upload any user bitstream using SRAM programming from JTAG.

Adding
--input-idcode 0x01113043
--output-idcode 0x01113043

fixes it (see intergalaktik/ulx4m#8)

For another board with similar chip
um5g-85k device ID 0x81113043
those 2 input/output idcode lines are not needed, bootloader
can jump to user bitstream.