defconfig : 8916_32 : Remove debug flags for less memory footprint

The following debug flags are removed in this commit:
-CONFIG_PAGE_OWNER
-CONFIG_SLUB_DEBUG_ON
-CONFIG_SLUB_DEBUG_PANIC_ON
-CONFIG_FREE_PAGES_RDONLY
With the inclusion of these flags, memory consumption is increasing
and hence LMK kicks in early and kills applications more frequently.
Hence, remove them to make sure out of memory is not observed
frequently.

Signed-off-by: Vignesh Radhakrishnan <vigneshr@codeaurora.org>
Signed-off-by: Bharat Pawar <bpawar@codeaurora.org>
Change-Id: Id05ebeb83e5a7010fdd28768b584e8fea52d2ae6