Drop (empty) google/snow mainboard directory

Snow was renamed to daisy a long time ago. The only reason, it seems,
the directory was still there, was a stray board_info.txt file that
probably went in shortly after the rename.

Change-Id: Iba08665e8486fcfeb214fcd05206a5f5683aea82
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/9302
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/mainboard/google/daisy/board_info.txt

@@ -1,3 +1,7 @@
+Vendor name: Samsung
+Board name: ARM Chromebook
 Category: laptop
+ROM package: SOIC-8
 ROM protocol: SPI
+ROM socketed: n
 Flashrom support: y

src/mainboard/google/snow/board_info.txt

@@ -1,7 +0,0 @@
-Vendor name: Samsung
-Board name: ARM Chromebook
-Category: laptop
-ROM package: SOIC-8
-ROM protocol: SPI
-ROM socketed: n
-Flashrom support: y