x86/mce: Make cmci_discover() quiet

cmci_discover() works out which machine check banks support CMCI, and
which of those are shared by multiple logical processors. It uses this
information to ensure that exactly one cpu is designated the owner of
each bank so that when interrupts are broadcast to multiple cpus, only one
of them will look in a shared bank to log the error and clear the bank.

At boot time cmci_discover() performs this task silently. But during
certain cpu hotplug operations it prints out a set of summary lines
like this:

CPU 35 MCA banks CMCI:0 CMCI:1 CMCI:3 CMCI:5 CMCI:6 CMCI:7 CMCI:8 CMCI:9 CMCI:10 CMCI:11
CPU 1 MCA banks CMCI:0 CMCI:1 CMCI:3
CPU 39 MCA banks CMCI:0 CMCI:1 CMCI:3
CPU 38 MCA banks CMCI:0 CMCI:1 CMCI:3
CPU 32 MCA banks CMCI:0 CMCI:1 CMCI:3
CPU 37 MCA banks CMCI:0 CMCI:1 CMCI:3
CPU 36 MCA banks CMCI:0 CMCI:1 CMCI:3
CPU 34 MCA banks CMCI:0 CMCI:1 CMCI:3

The value of these messages seems very low. A user might painstakingly
cross-check against the data sheet for a processor to ensure that all
CMCI supported banks are correctly reported, but this seems improbable.
If users really wanted to do this, we should print the information at
boot time too.

Remove the messages.

Signed-off-by: Tony Luck <tony.luck@intel.com>

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