defconfig: msm8909w: update mmap randomness for all targets

CTS malloc tests on Android 'N' expects higher entropy in
mmap returned address. Present value of mmap random bits
is not providing enough variations for 32 bit tasks.

Increase mmap_rnd_bits for 32bit and mmap_rnd_compat_bits
for 64bit targets to value of 16.

Change-Id: Ie97d5afb6c909560d3c42a0f85fff96701b201fc
Signed-off-by: Rajeswari Konda <rajkonda@codeaurora.org>
Signed-off-by: Bikshapathi Kothapeta <bkotha@codeaurora.org>