arm/arm64: defconfig: reduce the stack depot hash table size on qcs405

Reduce the hash table size of the stack depot so that we can enable the
page owner debug configuration on perf.

Change-Id: I92072282db5363e1103c0f85e45463732eeb126b
Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>