ARM: dts: msm: Add support for modem on MSM8953

Add support for modem which facilitates the loading
of modem firmware, authentication and bringing it
out of reset.

Change-Id: I7c34271b47e8d13ac844e2b906c56d58600eb942
Signed-off-by: Jingbiao Lu <jingbiao@codeaurora.org>