[BUGFIX][PATCH] gpiolib: add missing initialisation of bgc->dir

[Lothar WaÃmann]

bgpio_init() does not initialise the shadow variable for the GPIO_GDIR
register. Thus the first 'set_direction' call will clear the whole
GPIO_GDIR register of the affected GPIO bank.

Signed-off-by: Lothar WaÃmann <LW@xxxxxxxxxxxxxxxxxxx>

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