drm/msm/dsi_pll_10nm: Release clk hw on destroy and failure

drm/msm/dsi_pll_10nm: Release clk hw on destroy and failure

The 10nm pll driver didn't have any failure-path cleanup in register,
and the destroy function didn't unregister any of the hardware. This
patch adds both.

The reason things haven't been blowing up horribly is that msm_drv has a
reference count issue that keeps devices alive, so the destroy function
was never called. That will be fixed in a follow-up patch.

Reviewed-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190617201301.133275-1-sean@poorly.run