tint: Add USB support

Enable the USB during the initialization of tint. Without it USB
keyboards don't work, which makes this payload pointless on
systems where a PS/2 keyboard port isn't available.

Based on I98f0ccdb19d6b195572941cf87ce3221f57db7c5 (tint and
nvramcui: enable USB, update tint to 0.04+nmu1 with changes) [1]

[1] https://review.coreboot.org/17507/

Change-Id: Iaa8dfac0301ef19a2d76a0975d025b00e7f3807b
Signed-off-by: Nicola Corna <nicola@corna.info>
Reviewed-on: https://review.coreboot.org/18766
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>

payloads/external/tint/libpayload_tint.patch

@@ -823,7 +823,16 @@ diff -rupN tint-0.03b/tint.c tint/tint.c
  }
  
            /***************************************************************************/
-@@ -663,8 +680,15 @@ int main (int argc,char *argv[])
+@@ -561,6 +578,8 @@ int main (int argc,char *argv[])
+    int ch;
+    engine_t engine;
+    /* Initialize */
++   if (IS_ENABLED(CONFIG_LP_USB))
++      usb_initialize();
+    rand_init ();							/* must be called before engine_init () */
+    engine_init (&engine,score_function);	/* must be called before using engine.curshape */
+    finished = shownext = FALSE;
+@@ -663,8 +682,15 @@
     if (ch != 'q')
  	 {
  		showplayerstats (&engine);