ARM: dts: msm: reserve memory for continuous splash on 8916

Reserve memory at physical address for continuous splash in 8916.
This physical address is used for updating splash screen until
the first update comes from user space.

Change-Id: I0abb94fdfd2c1e977d1e125b00855cb828112878
Signed-off-by: Manoj Rao <manojraj@codeaurora.org>