msm: mdss: enable clocks before doing SW reset during recovery

There can be unclocked register access during DSI FIFO empty
error recovery case in command mode, so enable DSI core clocks
prior to doing SW reset.

Change-Id: Ic48561b979f1a13304dc2fa29f8008e8ff63c8ca
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>