[TOOLS][POWERPC] Use a smaller page array and place common code in utils.c

[TOOLS][POWERPC] Use a smaller page array and place common code in utils.c
Since all the bits must be loaded into the RMA there is no need to get
the entire page array, just those pages in the RMA.
We also place common functions in utils.c
Signed-off-by: Jimi Xenidis <jimix@watson.ibm.com>
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>