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Also modifies nvidia_mcp_gpio_set to cope with multiple MCP55 chips on
the same board, like on the Tyan S2915-E.

Corresponding to flashrom svn r1025.
Signed-off-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>
Acked-by: Adis Salcin <crow@linux.org.ba>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>