tegra: nvadsp: Use table to choose frequency

tegra: nvadsp: Use table to choose frequency

Use a frequency table so that the adsp clk frequency is a multiple of
the lowest frequency. This is so that timer prescalar values set does
not result in errors.

Bug 200007507

Change-Id: I03e8dc055e74cada13221d76126d77e006f2aab5
Signed-off-by: Ajay Nandakumar <anandakumarm@nvidia.com>
Reviewed-on: http://git-master/r/542548
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Puneet Saxena <puneets@nvidia.com>
Tested-by: Puneet Saxena <puneets@nvidia.com>
Reviewed-by: Nitin Kumbhar <nkumbhar@nvidia.com>