usb: gadget: tegra: Fix current limit for CDP port

usb: gadget: tegra: Fix current limit for CDP port

Do not overwrite the current limit with the value from
gadget layer for CDP port. Update the CDP current limit
to 1.5mA (as per BC1.2). Also, modifying few names
of variables/functions for readability.

Bug 1024302

Reviewed-on: http://git-master/r/189095
(cherry picked from commit b0f8fead09f2e0a70849d0cdaa00a08cdf0ec0fc)

Change-Id: I2d8c90fb03e41cf68089cd39c5a9b76523b5ec80
Signed-off-by: Rakesh Bodla <rbodla@nvidia.com>
Reviewed-on: http://git-master/r/190661
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Venkat Moganty <vmoganty@nvidia.com>