Put 'hostcmd' console command behind a config flag

This command was intended to be used for testing, but we have moved on
to the compiled unit tests. Let's put this command behind a config flag
to save precious flash space. This frees up about 640 bytes.

To make sure no one is using this, I searched for "hostcmd" in
platform/ec/test and third_party/autotest/files/server/site_tests.

BUG=None
TEST=make buildall
BRANCH=None

Change-Id: I3192214b71c033c2388f687ed891203d1d119bb9
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/214828
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>

common/host_command.c

@@ -626,6 +626,7 @@ DECLARE_HOST_COMMAND(EC_CMD_TEST_PROTOCOL,
 /*****************************************************************************/
 /* Console commands */
 
+#ifdef CONFIG_CMD_HOSTCMD
 static int parse_byte(char *b, uint8_t *out)
 {
 	int i;
@@ -726,6 +727,7 @@ DECLARE_CONSOLE_COMMAND(hostcmd, command_host_command,
 			"cmd ver param",
 			"Fake host command",
 			NULL);
+#endif /* CONFIG_CMD_HOSTCMD */
 
 static int command_hcdebug(int argc, char **argv)
 {

include/config.h

@@ -317,6 +317,7 @@
 #undef CONFIG_CMD_ECTEMP
 #undef CONFIG_CMD_FLASH
 #undef CONFIG_CMD_GSV
+#undef CONFIG_CMD_HOSTCMD
 #undef CONFIG_CMD_ILIM
 #undef CONFIG_CMD_JUMPTAGS
 #define CONFIG_CMD_LID_ANGLE