wic: Remove rpmmisc call from livecd

We don't currently use LiveCDImageCreator, but it makes calls when
initialized via the plugin interface to rpmmisc module functions,
which we don't want the dependency on.

To make it (and LiveUSBImageCreator) happy, we give it the dummy
"i386" value for now.

(From OE-Core master rev: e10ae516cfc10900ed12e84c743e3a7127372135)

(From OE-Core rev: a3cc57cf3116c997ec11dd3cbfa3b0d615e5dabc)

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/mic/imager/livecd.py

@@ -741,7 +741,7 @@ hiddenmenu
         self._configure_syslinux_bootloader(isodir)
         self._configure_efi_bootloader(isodir)
 
-arch = rpmmisc.getBaseArch()
+arch = "i386"
 if arch in ("i386", "x86_64"):
     LiveCDImageCreator = x86LiveImageCreator
 elif arch.startswith("arm"):