boards: renesas: Edit rcar_spider_s4 full_name

Edit the rcar_spider_s4 board full_name
from specific A55 name to generic one
as it is used as main name for the whole board.

Signed-off-by: Aymeric Aillet <aymeric.aillet@iot.bzh>

Author: aaillet

boards/renesas/rcar_spider_s4/board.yml

@@ -1,6 +1,6 @@
 board:
   name: rcar_spider_s4
-  full_name: R-CAR Spider S4 (ARM64)
+  full_name: R-Car Spider
   vendor: renesas
   socs:
   - name: r8a779f0