Enable kmemleak auto scan thread on boot up

configname: CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN

Linux Kernel Configuration
└─>Kernel hacking
└─>Memory Debugging
└─>Enable kmemleak auto scan thread on boot up
In linux kernel since version 5 (release Date: 2019-03-03)  
Depending on the cpu, kmemleak scan may be cpu intensive and can
stall user tasks at times. This option enables/disables automatic
kmemleak scan at boot up.

Say N here to disable kmemleak auto scan thread to stop automatic
scanning. Disabling this option disables automatic reporting of
memory leaks.

If unsure, say Y.