Patches that integrate PLL and DDR3 initialization

[Ed Sutter]

Jarielle,
Good stuff!!  I'll try to test this out (and push) tonight.
Ed
> These series of patches incorporate the following major additions/modifications:
>
> * Enables memory commands via INCLUDE_MEMCMDS
> * Initializes MPU, Core, Per, and DDR PLLs
> * Sets the ARM core frequency from 500 MHz to 1 GHz
> * Initializes the DDR3 memory
> * Maps uMon RAM in DDR3 memory space
>
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