ARM: dts: msm: increase size of adsp mem region for 8150

Increase size of CMA heap by 4 MB to meet both sensors and audio
memory requirements.

Change-Id: I0565969a8f819cf79bdbc59f7e26061c3c20eddf
Acked-by: Thyagarajan Venkatanarayanan <venkatan@qti.qualcomm.com>
Signed-off-by: Tharun Kumar Merugu <mtharu@codeaurora.org>