ARM: dts: msm: Modify modem and cnss memory region for SDW2500

As modem need 6MB more memory to support CDMA, it need to change
the reserved memory of modem. And as the reserved memory of modem
and cnss are together, it also need to modify the reserved memory
of cnss.

Change-Id: Ib18332970af9ac4193d5d61752b2beb54296e4d6
Signed-off-by: Jiangjiang Shen <jiangjia@codeaurora.org>