lm4: Add debug output for overlapping HCs.
lm4: Add debug output for overlapping HCs.

Currently, when a host command is received which would overlap with an
ongoing host command, we ignore it silently.  This commit simply logs a
line to the EC console stating that we are ignoring the overlapping host
command.

BRANCH=None
BUG=chrome-os-partner:23806
TEST=make -j buildall tests
TEST=Build, flash, and boot samus. Using ectool, read 64K from flash
while also querying the current EC switch positions.  Observe the log
message being printed to the EC console.

Change-Id: Ic0d249ccec2efb9600bcf8567392add1ee6295d9
Signed-off-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@google.com>
Reviewed-on: https://chromium-review.googlesource.com/290545
Trybot-Ready: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Tested-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Commit-Queue: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>

akappy7/ChromeOS_EC_LED_Diagnostics,fourier49/BZ_DEV_EC,fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,fourier49/BZ_DEV_EC,coreboot/chrome-ec,fourier49/BZ_DEV_EC,coreboot/chrome-ec,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,akappy7/ChromeOS_EC_LED_Diagnostics,akappy7/ChromeOS_EC_LED_Diagnostics