msm: mdss: handle mmagic mdss axi clock for thulium target

MDSS module needs turn on mmagic AXI clock on thulium target
when it tries to fetch data or write data to output buffers.
This change adds that support.

Change-Id: I3e84046274d377c30028608217247bdfb32bc341
[veeras@codeaurora.org: As part of 3.18 upgrade,
remove msmthulium-mdss.dtsi changes from this commit]
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>