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SCTLR_EL3.EE is being configured too late in bl1_arch_setup() and
bl31_arch_setup() after data accesses have already occured on
the cold and warm boot paths.

This control bit must be configured immediately on CPU reset to
match the endian state of the firmware (little endian).

Fixes ARM-software/tf-issues#145

Change-Id: Ie12e46fbbed6baf024c30beb50751591bb8c8655