techpack: disp: pll: Fix the clk get rate check in dsi pll

Updates the clk get rate check in dsi pll. This fixes
display clock voting for SVS instead of LSVS issue.

Change-Id: Ibdedd8f476d7a38858d18d233517699b61cf76f1
Signed-off-by: Ritesh Kumar <riteshk@codeaurora.org>
Signed-off-by: Lipsa Rout <lrout@codeaurora.org>