Clean up host command module
Clean up host command module

Code cleanup only; no functional changes

BUG=chrome-os-partner:15579
BRANCH=none
TEST=ectool hello -> success

Change-Id: I40391b66efaeab873e99500d4f58a5a779eb2c71
Signed-off-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/36557
Reviewed-by: Simon Glass <c00b0378376498bd9cd974c388df8854c0131d27@chromium.org>

akappy7/ChromeOS_EC_LED_Diagnostics,fourier49/BZ_DEV_EC,alterapraxisptyltd/chromium-ec,gelraen/cros-ec,longsleep/ec,eatbyte/chromium-ec,md5555/ec,thehobn/ec,gelraen/cros-ec,coreboot/chrome-ec,md5555/ec,thehobn/ec,mtk09422/chromiumos-platform-ec,mtk09422/chromiumos-platform-ec,fourier49/BZ_DEV_EC,mtk09422/chromiumos-platform-ec,md5555/ec,fourier49/BZ_DEV_EC,alterapraxisptyltd/chromium-ec,gelraen/cros-ec,fourier49/BIZ_EC,fourier49/BIZ_EC,fourier49/BIZ_EC,md5555/ec,coreboot/chrome-ec,thehobn/ec,coreboot/chrome-ec,eatbyte/chromium-ec,fourier49/BZ_DEV_EC,longsleep/ec,akappy7/ChromeOS_EC_LED_Diagnostics,akappy7/ChromeOS_EC_LED_Diagnostics,alterapraxisptyltd/chromium-ec,eatbyte/chromium-ec,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,fourier49/BIZ_EC,mtk09422/chromiumos-platform-ec,gelraen/cros-ec,longsleep/ec,coreboot/chrome-ec,thehobn/ec,coreboot/chrome-ec,alterapraxisptyltd/chromium-ec,eatbyte/chromium-ec,longsleep/ec,akappy7/ChromeOS_EC_LED_Diagnostics