ia64: Cleanup EXPORT_SYMBOL usage

	This cleans up the use of EXPORT_SYMBOL in ia64_ksyms.c by
	moving most of them to the place where the symbol is defined.
	Ideally, only symbols defined in assembler sources should
	remain here, but there are some cases where an EXPORT_SYMBOL
	is missing outside the arch/ia64 tree.  I did not change them
	for now.  Also, EXPORT_SYMBOL_NOVERS is obsolete.