i7core_edac: Improve corrected_error_counts output for RDIMM

Just cosmetics. instead of showing something like:

socket 0, channel 2dimm0: 1
dimm1: 0
dimm2: 0
socket 1, channel 2dimm0: 0
dimm1: 0
dimm2: 0

Show:

socket 0, channel 2 RDIMM0: 1 RDIMM1: 0 RDIMM2: 0
socket 0, channel 2 RDIMM0: 0 RDIMM1: 0 RDIMM2: 0

This is more synthetic and easier to parse.

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