i7300_edac: Cleanup: reorganize the file contents

This change should do no functional change. It just rearranges the
contents of the c file, in order to make easier to understand and
maintain it.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --cc drivers/edac/i7300_edac.c
Simple merge