msm_fb: mdss: Fix dsi controller reset sequence during dsi initialization

Move the dsi_sw_reset from panel ON sequence to controller
initialization function. Enable clock lanes and disable
controller before doing reset.

Change-Id: I570615a931214021360070cd1cfea4ed3b6812d5
Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>