ARM: tegra: enable errata 727915 for Tegra3

ARM: tegra: enable errata 727915 for Tegra3

By-way maintenance doesn't reliably work with enabled
lp2_in_idle on Tegra3 platform which uses R3P1_50
revision of pl310.

Enable errata 727915 for Tegra3 to avoid system hang.

Change-Id: Ia296c1d5b35b8f28353c15d1e4622686bc7d3beb
Signed-off-by: Kirill Artamonov <kartamonov@nvidia.com>
Reviewed-on: http://git-master/r/127225
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Juha Tukkinen <jtukkinen@nvidia.com>
Rebase-Id: Rb9962cb134852e5482fa5320b9606ecfd9ffb5a2