drm/xe/observation: Drop empty sysctl table entry #6721

Job	Run time
Clang build x86_64	4m 20s
GCC build arm64 allmodconfig	2m 19s
GCC build arm64	18m 1s
GCC static -fanalyzer	5m 5s
GCC build i386	15m 43s
GCC build X86_64	20m 37s
GCC build X86_64 with W=1	3m 2s
GCC build X86_64 with W=1 allmodconfig	1m 53s
Sparse check	2m 59s
	1h 13m 59s

Provide feedback