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This patch introduces a new function called 'print_entry_point_info'
that prints an entry_point_t structure for debugging purposes.
As such, it can be used to display the entry point address, SPSR and
arguments passed from a firmware image to the next one.

This function is now called in the following images transitions:
 - BL1 to BL2
 - BL1 to BL31
 - BL31 to the next image (typically BL32 or BL33)

The following changes have been introduced:

 - Fix the output format of the SPSR value : SPSR is a 32-bit value,
   not a 64-bit one.

 - Print all arguments values.
   The entry_point_info_t structure allows to pass up to 8 arguments.
   In most cases, only the first 2 arguments were printed.
   print_entry_point_info() now prints all of them as 'VERBOSE'
   traces.

Change-Id: Ieb384bffaa7849e6cb95a01a47c0b7fc2308653a