ARM: tegra: clock: Increase boost_up_threshold for AVP clock

Increase the boost_up_threshold to 85 for ULP audio

bug 1009849

Change-Id: I4b1b746f445f5c2804befa52ae95c69b6b467083
Signed-off-by: Vandana Salve <vsalve@nvidia.com>
Reviewed-on: http://git-master/r/114620
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Reviewed-by: Aleksandr Frid <afrid@nvidia.com>