msm: mdss: Do not force commands on HS mode by default

Do not force the commands to be sent in HS mode, and let the
caller function set the mode as required. Make sure that the
panels which can recieve panel on/off commands only in LP
mode wont go to bad state due to this forcing.

Change-Id: I093978cb3bfd3022e4158c93d154e5c9fcb32e66
Signed-off-by: Shivaraj Shetty <shivaraj@codeaurora.org>