drm/xe/observation: Drop empty sysctl table entry #6720

Job	Run time
GCC build arm64	17m 48s
GCC static -fanalyzer	5m 40s
GCC build arm64 allmodconfig	2m 26s
Clang build x86_64	5m 19s
GCC build i386	15m 31s
GCC build X86_64	17m 18s
GCC build X86_64 with W=1	3m 34s
GCC build X86_64 with W=1 allmodconfig	1m 50s
Sparse check	3m 9s
	1h 12m 35s

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