Merge pull request #2 from linux4kix/imx6

SPL DirectBoot support
Revert "mx6: fix build due to divide u64/u32"

The calculation in the mxc_get_pll_pfd() uses freq as u64, which is essential
since in the bottom it's multiplied by 18 and given that the PLL_BUS can be
528000000 then it might overflow

This reverts commit b7495f0347541eb068d11ff592d2d1f83d174ad9.
Revert "arm: mx6: PFD locking errata"

This reverts commit 6fc18f0fa040b8e32eed267445760b1baf7f2b3a.
Revert "arm: mx6: Selectively twiddle pfd's"

This reverts commit 2d0c4f544da73e1d2f09b9c1281298ebf8e68ffc.
cubox-i: Add support for ramdisks

This adds support to the default boot script to load a ramdisk
image specified in the uEnv.txt.