[U-Boot] RFD: ARM: enable HYP mode on OMAP5

[Ian Molton]

Hi folks,

My colleague Clemens Fischer, and I were able to bring up the OMAP5 CPU 
in HYP mode with the following patch to u-boot.

Obviously the patch is not production grade yet, but we feel that it 
would be of use to discuss how best to integrate the code into u-boot.

The code wakes up CPU1 before putting CPU0 into HYP mode, and CPU1 goes 
back to sleep once it has entered HYP mode itself.

With this patch, a near-unmodified mainline linux kernel (patched for 
ARM KVM only) will boot up with HYP mode enabled.

Many thanks to Marc and Christoffer for their help getting KVM up and 
running!

Comments are welcome.

-Ian