clk: msm: mdss: add support for chip serial number in dfps info

Dfps info is calculated for a specific msm part and needs to be
used for the same. Add a chip serial number for the dfps info so
that the PLL trim codes are used for the same msm part on which
they are generated.

Change-Id: I6f1e519c1e9278b35dfbdf3d9ba4a2ed0e1a6a78
Signed-off-by: Ashish Garg <ashigarg@codeaurora.org>