udev: Add Mayflash 64 USB adapter MF103

[ibizaman]

Sorry for the previous wrong PR. I didn't know what I was doing at the time.

How I know this is right:

• Put in adapter.
• Saw the controllers were not configured.
• Saved controller profile.
• This file was added.
• Copied over all mapping from existing Mayflash mapping.
• Tweaked A and B button.
• Removed adapter.
• See controllers disconnected.
• Put in adapter.
• See controllers recognized and configured correctly.

[ibizaman]

Actually, this PR is not read to be merged, I still saw some issues.

[ibizaman]

I confirm this work. But then, in the core config, I needed this additional remap file for A and B to be selected correctly:

input_libretro_device_p1 = "1"
input_libretro_device_p2 = "1"
input_libretro_device_p3 = "1"
input_libretro_device_p4 = "1"
input_player1_analog_dpad_mode = "0"
input_player1_btn_a = "0"
input_player1_btn_b = "1"
input_player1_btn_y = "-1"
input_player2_analog_dpad_mode = "0"
input_player3_analog_dpad_mode = "0"
input_player4_analog_dpad_mode = "0"
input_remap_port_p1 = "0"
input_remap_port_p2 = "1"
input_remap_port_p3 = "2"
input_remap_port_p4 = "3"