irqchip: agic: Ability to enable AGIC t210 clocks

irqchip: agic: Ability to enable AGIC t210 clocks

Clocks for AGIC cannot be enabled by the clock framework,
since the clock framework get initialized after the
interrupt controller has been initialized.

Adding the ability to initialize the clocks within the
gic driver by use of node property "enable_agic_clks"
to agic-controller node and also adding the base address
of clocks.

bug 1810165

Change-Id: Ib701815fecfdff5a2f727c68696414a54fbc2737
Signed-off-by: Ajay Nandakumar <anandakumarm@nvidia.com>
Signed-off-by: Ravindra Lokhande <rlokhande@nvidia.com>
Reviewed-on: http://git-master/r/1266607
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Tested-by: Bharat Nihalani <bnihalani@nvidia.com>