pkg/kfuzztest: skip description generation test on non-amd64 arches #596

Job	Run time
aux	4m 11s
build	22h 6m 45s
old	7m 31s
dashboard	1s
gvisor	3m 57s
race_dashboard	1s
race	1s
arch (presubmit_arch_windows)	3m 32s
arch (presubmit_arch_freebsd)	6m 27s
arch (presubmit_arch_darwin)	3m 48s
arch (presubmit_arch_executor)	3m 16s
arch (presubmit_arch_netbsd)	3m 46s
arch (presubmit_arch_openbsd)	3m 42s
arch (presubmit_arch_linux)	10m 21s
	22h 57m 19s

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