g: expand pinmux to print info on spi and i2c
g: expand pinmux to print info on spi and i2c

pinmux only prints uart and gpio information. This change makes pinmux
print i2c and spi connections too.

This does not handle the direct pin to peripheral mappings, so the spi0
and sps0 peripheral pins still won't show up.

BUG=none
BRANCH=cr50
TEST=run pinmux on reef

Change-Id: Iaa6204e2af7f018569b92280bd1367aef201cc28
Signed-off-by: Mary Ruthven <81380f3403fed74252e92df3ed012a1819ec6296@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/501172
Reviewed-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Reviewed-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>

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