defconfig: sdm845: enable iommu debug tracking

Enable CONFIG_IOMMU_DEBUG_TRACKING into perf-defconfig.
This config is needed for the iommu page-table parsing
to proceed successfully in the lrdp tool.

Change-Id: Iea8020dfb93ba0cc37c0626a2e7d16fc1069e5fc
Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>