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Add pin control APIs which driver can use to query
pin information from firmware. Using these APIs,
driver do not need to maintain hard-coded pin database.

Major changes in patch are:
- Add pin database with pins, functions and function groups
  information
- Implement APIs for pin information queries
- Update pin control APIs for get/set functions to use new
  pin control database. Remove pin database which was added
  earlier.
Signed-off-by: Rajan Vaja <rajanv@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>

Implement pin control APIs which uses MMIO operations
to set/get values of configuration parameters.
Signed-off-by: Rajan Vaja <rajanv@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>

Implement pin control APIs which uses MMIO operations
to set/get functions for the given pin.
Signed-off-by: Rajan Vaja <rajanv@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>