chip/mt_scp/clock: Fix frequency meter divider (1024, not 1000)
chip/mt_scp/clock: Fix frequency meter divider (1024, not 1000)

The frequency meter measures at 26 Mhz / 1024, not 26 Mhz / 1000,
and use DIV_ROUND_CLOSEST to get a closer frequency meter target.

Also, print the frequencies in kHz, not Mhz.

BRANCH=none
BUG=b:120176040
TEST=Add new timer sourced from (precise) 32.768 kHz to tick
     every second, see that the interval is close to a second.

Change-Id: I32a9265187ed2936a928f2c09da8f544d814b5ae
Signed-off-by: Nicolas Boichat <f3daba1cdc403799935674d3cd4b0e5bd1804232@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1672650
Reviewed-by: Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec