RAMster selects HAVE_ALIGNED_STRUCT_PAGE on 64 bit systems when it should not

[Martin Walch <walch.martin@web.de>]

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At drivers/staging/zcache/Kconfig:13 it says

config RAMSTER
	bool "Cross-machine RAM capacity sharing, aka peer-to-peer tmem"
	depends on CONFIGFS_FS=y && SYSFS=y && !HIGHMEM && ZCACHE=y
	depends on NET
	# must ensure struct page is 8-byte aligned
	select HAVE_ALIGNED_STRUCT_PAGE if !64_BIT
	default n

However, there is no config section for the symbol 64_BIT, so !64_BIT will 
always be evaluated to true, and therefore RAMSTER will always select 
HAVE_ALIGNED_STRUCT_PAGE, disregarding any breakage.

64_BIT should probably say 64BIT which has corresponding config sections in 
arch/{x86,ia64,mips,s390,tile,alpha,arm64,sparc,parisc,powerpc}/Kconfig and 
arch/x86/um/Kconfig.

I do not know if there are any bad consequences about this, but I guess this 
should be reviewed and fixed, probably by just removing the underscore from 
64_BIT in drivers/staging/zcache/Kconfig.

Regards
Martin Walch
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