This patch changes PCMCIA MECR handling such that:
	- MECR is changed in one function only and atomically
	- a additional callback for boards to allow them to
	  tweak BS values on a per-socket basis

Note: I don't know wether or not tish changes are WIP or done
already. If so, please drop it and send me a note.

Changes files:
linux/drivers/pcmcia/sa1100_generic.h
linux/drivers/pcmcia/sa1100_generic.c