ARM: tegra: config: enable performance governor

ARM: tegra: config: enable performance governor

During boot, the CPU governor is getting set
to performance for a faster boot up and hence this
needs to be enabled.

Bug 1532473
Bug 1519610

Change-Id: Idf9ba9d30be1e09d9b9fc4245b96a43a56f2d799
Signed-off-by: Preetham Chandru R <pchandru@nvidia.com>
Reviewed-on: http://git-master/r/436578
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: Venkat Moganty <vmoganty@nvidia.com>