defconfig: Enable page_owner for sdmsteppe 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: Idf321138e69a246f357ded77e521ec453d16e7dc
Signed-off-by: Yogesh Lal <ylal@codeaurora.org>