board/freescale/common: ZM7300 driver

Adds Support for PowerOne ZM7300 voltage regulator.
This device is available on some Freescale Boards like B4860QDS
and has to be programmed to adjust the voltage on the board.

The device is accessible via I2C interface.

Signed-off-by: Shaveta Leekha <shaveta@freescale.com>
Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
diff --git a/board/freescale/common/Makefile b/board/freescale/common/Makefile
index f6a0879..22b57cc 100644
--- a/board/freescale/common/Makefile
+++ b/board/freescale/common/Makefile
@@ -48,6 +48,7 @@
 obj-$(CONFIG_P5040DS)		+= ics307_clk.o
 obj-$(CONFIG_VSC_CROSSBAR)    += vsc3316_3308.o
 obj-$(CONFIG_IDT8T49N222A)	+= idt8t49n222a_serdes_clk.o
+obj-$(CONFIG_ZM7300)		+= zm7300.o
 
 # deal with common files for P-series corenet based devices
 obj-$(CONFIG_P2041RDB)	+= p_corenet/