[coreboot] [PATCH]Make parser state local to parser

[Patrick Georgi]

Hi,

attached patch makes cur_parent and cur_bus, two variables that track
internal parser state, local to the parser. Before, the device tree
handling had to use them, too - their values are now passed as arguments
instead.

Tested to give identical results for all boards.

Signed-off-by: Patrick Georgi <patrick.georgi at coresystems.de>
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