Allow system to define max io regions per device
Allow system to define max io regions per device

Allow the system to define the maximum number of io regions per
device.

Signed-off-by: Wendy Liang <cac46fad14f88489ab4dbc3c1082c7dafae20187@xilinx.com>

forg0ne/libmetal,forg0ne/libmetal