ish-ipc: remove IPC/Host command related flag
ish-ipc: remove IPC/Host command related flag

Remove flag related to IPC interface & Host command protocol
to add new IPC & HECI protocol

BUG=b:79676054
TEST=none

Change-Id: I4707e2845c38a4d86ab8bffad93f7024fa9e5eb5
Signed-off-by: Kyoung Kim <0fa79f8568f83616b048a28252e7d9ad3c59c80d@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/1263896
Commit-Ready: ChromeOS CL Exonerator Bot <fa429e5907f00867f797423aea74327bb02c91b6@appspot.gserviceaccount.com>
Tested-by: Kyoung Il Kim <0fa79f8568f83616b048a28252e7d9ad3c59c80d@intel.com>
Reviewed-by: Caveh Jalali <08e24a66aefda7a55ca7d73f8903e0fb16eec763@google.com>
Reviewed-by: Kyoung Il Kim <0fa79f8568f83616b048a28252e7d9ad3c59c80d@intel.com>

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