ARM: tegra14: bbc: change emc floor clock

ARM: tegra14: bbc: change emc floor clock

Two EMC clocks are assigned to BBC, namely emc_bw
and emc_fl. The emc_fl should be used to set the
floor frequency and emc_bw is used by ISO manager.
Remove old unused definition from the clocks table.

Bug 1284210

Change-Id: I9926bead2dcaee2b1c5d50d21b7ed074f7fa5a78
Signed-off-by: Vinayak Pane <vpane@nvidia.com>
Reviewed-on: http://git-master/r/228609
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Neil Patel <neilp@nvidia.com>
Reviewed-by: Steve Lin <stlin@nvidia.com>
Reviewed-by: Aleksandr Frid <afrid@nvidia.com>