chip/host: Match fprintf type and format string
chip/host: Match fprintf type and format string

BUG=b:185477664
BRANCH=none
TEST=New toolchain doesn't fail on chip/host/system.c
anymore. Tests still pass.

Signed-off-by: Patrick Georgi <bc411205f21846a74924ee7b489c75617ec76078@google.com>
Change-Id: I31ee1328f757496dc5cb2d215da1a4b0d79b88ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2853600
Reviewed-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Reviewed-by: Manoj Gupta <1d49d0f302d724a1dc5fc4d717d15418e9808ddd@chromium.org>
Commit-Queue: Patrick Georgi <bc411205f21846a74924ee7b489c75617ec76078@chromium.org>
Tested-by: Patrick Georgi <bc411205f21846a74924ee7b489c75617ec76078@chromium.org>

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