pysystemmgr: Dynamically locate the gpiochip

This is required due to differences in the number of GPIOs between
AST2400 and AST2500, which affects base GPIO value in the GPIO number
space.

Change-Id: I755aa340dc6a06a47a43bff8afb99d3a75f39185
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
1 file changed