sysgen: Cosmetic cleanup of memory pool generation code

Does renaming of variables and comments to conform to the
"block set" and "quad-block" terminology now used by the kernel's
memory pool code. (Note: This renaming also includes names of
some variables generated by sysgen.)

Change-Id: I8e04cb1ee9ca83daddb487b477da7dd2e1004fd8
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>