defconfig: Enable page_owner for sm8150 on perf config

This patch enables CONFIG_PAGE_OWNER on perf config.
The feature is not enabled by default and needs
to be enabled via boot param "page_owner=on".

Set STACK_HASH_ORDER_SHIFT to 12 to reduce
stack depot hash size.

Default value of STACK_HASH_ORDER_SHIFT=20 makes stack depot
to consume 8MB of static memory.

With STACK_HASH_ORDER_SHIFT=12 stack depot consume only 104KB.

The time taken to read from /sys/kernel/debug/page_owner
increased by around 60 secs with this patch on a 6 GB target,
but we can live with it as it's a only debug feature.

Change-Id: I772aa69865ee30c4834cfb2fa0d7feafd3853c0c
Signed-off-by: Yogesh Lal <ylal@codeaurora.org>