Support arcade PS2 (COH-H models)

[israpps]

This is an attempt to make wLaunchELF isr compatible with the Namco system 246 and system 256.

Changes:

• Flash IOPRP with homebrew IOMAN/FILEIO
• use rom MCMAN/MCSERV to allow access to security dongle
• use XMC RPC instead of MC RPC to avoid RPC hangs
• use libpadx instead of libpad to avoid RPC hangs
• load rom CDVDFS driver to avoid RPC hangs
• special checks to avoid security dongle bootfile overwrite

CHECKS BEFORE MERGING

• it boots
• it can access usb
• it can access ps2 memory card
• it can access security dongle

OPTIONAL CHECKS

• it can access HDD
• it can access network
• it can access disc

[israpps]

add internal hdd exfat support for ps2

not anytime soon