clk: qcom: mdss: fix wrong PLL driver registration

Wrong MDSS PLL driver is getting registered because of
missing break command in a switch case which selects
PLL driver based on interface type. Add the missing
break command to fix it.

Change-Id: I76db106b4d093197e803d235a65efcdb0daa4089
Signed-off-by: Narender Ankam <nankam@codeaurora.org>