ARM: dts: msm: Increase the rmts shared ram to 2 MB in 8996

Increase the rmts shared ram size from 1.5 MB to 2 MB since
there is a need for a larger modem filesystem in 8996.

Change-Id: I05ed9e169b1ff797303a0028ad1e671feb3fa2c2
Signed-off-by: Nikhilesh Reddy <reddyn@codeaurora.org>