msm: mdss: update the correct panel info for dfps clock method

Current code does not reflect the correct panel information
when user space request the panel info and fps data
after the fps update when using the clock method.
This change fixes the code, so further calls to get
the screen info have the correct panel data, as it
is done for vfp method already.

Change-Id: I2cae33cad02f43a9b887c8bdc55aca876e47a99a
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>