runqemu-internal: add "console=ttyS0" to ramfs image kernel parameters

We need this kernel command parameter so that when we start a ramfs
image, we can actually get some output. Although we can make this
happen by specifying the 'bootparams' for the 'runqemu' command, it's
better to make this the default behaviour.

(From OE-Core rev: 3d202594bb92fe75cd70f81345e64c2179b52c32)

(From OE-Core rev: 99162f2aef8715797bde98d9f9d4b52ddbca4996)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/runqemu-internal

@@ -550,7 +550,7 @@ fi
 
 if [ "x$RAMFS" = "xtrue" ]; then
     QEMUOPTIONS="-initrd $ROOTFS -nographic"
-    KERNCMDLINE="root=/dev/ram0 debugshell"
+    KERNCMDLINE="root=/dev/ram0 console=ttyS0 debugshell"
 fi
 
 if [ "x$ISOFS" = "xtrue" ]; then