sconfig: Add a new "SPI" device type

Update sconfig lex and yacc files to add support for a new "SPI" device
type in the devicetree. SPI device takes only parameter i.e. chip select
number for the device on the SPI bus.

Re-generate the shipped files for sconfig using flex 2.6.0 and bison
3.0.4 (make CONFIG_SCONFIG_GENPARSER=1). Clean up local paths that leak
into generated files.

BUG=chrome-os-partner:59832
BRANCH=None
TEST=Compiles successfully.

Change-Id: If0831e25b3e4ed87827ad92356d7bf47b6387884
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/18339
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

util/sconfig/sconfig.tab.h_shipped

@@ -71,7 +71,8 @@ extern int yydebug;
     IOAPIC_IRQ = 281,
     IOAPIC = 282,
     PCIINT = 283,
-    GENERIC = 284
+    GENERIC = 284,
+    SPI = 285
   };
 #endif