msm: qpnp-haptic: add DT property for back-emf generation delay

For auto resonance detection to work properly, sufficient
back-emf has to be generated. In general, back-emf takes
some time to build up. When the auto resonance mode is chosen
as QWD, high-z will be applied for every LRA cycle and hence
there won't be enough back-emf at the start-up. Hence, the
motor needs to vibrate for few LRA cycles after the PLAY bit
is asserted. So disable the auto resonance and enable it back
after some delay. Add DT property to configure this delay value.

CRs-Fixed: 833062
Change-Id: I688329f642ca9d506e203f448da5d874b91b77ff
Signed-off-by: Abinaya P <abinayap@codeaurora.org>