ARM: dts: msm: Add common CMA device configuration for msm8909w & apq8009

TZ expects firmware regions under 512MB. BG firmware region is
allocated from common CMA region. Add common CMA configuration
and restrict it within 512MB region for msm8909w and apq8009.

Change-Id: I94e0616fd5a5c577613c02aeaa0de541d5b23d9d
Signed-off-by: Vishwanath Raju K <vishk@codeaurora.org>