ddr: add LPDDR2 data from JESD209-2

add LPDDR2 data from the JEDEC spec JESD209-2. The data
includes:

1. Addressing information for LPDDR2 memories of different
   densities and types(S2/S4)
2. AC timing data.

This data will useful for memory controller device drivers.
Right now this is used by the TI EMIF SDRAM controller
driver.

Signed-off-by: Aneesh V <aneesh@ti.com>
Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Benoit Cousson <b-cousson@ti.com>
[santosh.shilimkar@ti.com: Moved to drivers/memory from drivers/misc]
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/lib/Kconfig b/lib/Kconfig
index 4a8aba2..0e25c03 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -353,6 +353,14 @@
 	  This option provides an implementation of the CORDIC algorithm;
 	  calculations are in fixed point. Module will be called cordic.
 
+config DDR
+	bool "JEDEC DDR data"
+	help
+	  Data from JEDEC specs for DDR SDRAM memories,
+	  particularly the AC timing parameters and addressing
+	  information. This data is useful for drivers handling
+	  DDR SDRAM controllers.
+
 config MPILIB
 	tristate
 	select CLZ_TAB