Add generic driver for on-chip SRAM

These patches add support to configure on-chip SRAM via device-tree
node or platform data and to obtain the resulting genalloc pool from
the physical address or a phandle pointing at the device tree node.
This allows drivers to allocate SRAM with the genalloc API without
hard-coding the genalloc pool pointer.

The on-chip SRAM on i.MX53 and i.MX6q can be registered via device tree
and changed to use the simple generic SRAM driver:

		ocram: ocram@00900000 {
			compatible = "fsl,imx-ocram", "sram";
			reg = <0x00900000 0x3f000>;
			alloc-order = <12>;
 		};

A driver that needs to allocate SRAM buffers, like the video processing
unit on i.MX53, can retrieve the genalloc pool from a phandle in the
device tree using of_get_named_gen_pool(node, "iram", 0) from patch 1:

		vpu@63ff4000 {
			/* ... */
			iram = <&ocram>;
 		};

Changes since v4:
 - Added Matt Porter's patch to configure alloc order, so that the driver
   can be used for TI Davinci. 
 - Removed device tree patches as those should go through the ARM SoC tree.

regards
Philipp

---
 Documentation/devicetree/bindings/misc/sram.txt |   27 +++++
 drivers/misc/Kconfig                            |    9 ++
 drivers/misc/Makefile                           |    1 +
 drivers/misc/sram.c                             |  133 +++++++++++++++++++++++
 include/linux/genalloc.h                        |   14 +++
 include/linux/platform_data/sram.h              |   25 +++++
 lib/genalloc.c                                  |   67 ++++++++++++
 7 files changed, 276 insertions(+)

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