[Yaffs] yaffs2 patches

[Artis Kugevics]

Hello,

I would like to submit back to Yaffs community same changes I have done to 
yaffs2.

miscfix.patch:
	1) bugfix in case if Chunk Erase Check is not done (failed write will make a 
lot of bad blocks);
	2) lower limit of nReservedBlocks and nCheckpointReservedBlocks in case of 
small partition (otherwise on 4MB partition only 2MB is usable in case of 
large block nand);

rwcounters.patch:
	fixed nPageReads and nPageWrites to work on large block nand devices as well;

badblocks.patch:
	added /proc/yaffs to show number of bad blocks;

ccwarn.patch:
	fixed few compilation warnings;

Best regards,
Artis
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