ryu: Add TPS65913 regs/init for VDD_CPU 1.0V

Other default slams should be added later to the init table
once we know what the kernel touches. But for now, only VDD_CPU
is needed.

Also slipped in a minor name change in mainboard.c

BRANCH=none
BUG=none
TEST=none, no HW here for me to test on yet

Change-Id: Ifbe86192449ed0466085808a0a12a15a7b6a1795
Signed-off-by: Tom Warren <twarren@nvidia.com>
Reviewed-on: https://chromium-review.googlesource.com/208385
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
(cherry picked from commit 53b332fb12cd685fbec265695333a70c4064524c)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-on: http://review.coreboot.org/8645
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/mainboard/google/rush_ryu/mainboard.c

@@ -30,6 +30,6 @@ static void mainboard_enable(device_t dev)
 }
 
 struct chip_operations mainboard_ops = {
-        .name   = "rush",
+        .name   = "rush_ryu",
         .enable_dev = mainboard_enable,
 };