ARM: dts: msm: add DT entries to enable continuous splash on 8939

Add DT entry for reserving memory for continuous splash and also
enable continuous splash for msm8939 MTP and CDP.

Change-Id: I0631603986e95fc6710c0a2fde7ca9d34683892f
Signed-off-by: Radhika Ranjan Soni <rrsoni@codeaurora.org>