hal: renesas: ra: Update status version of README

Update status version of README to 5.8.0

Signed-off-by: Khoa Nguyen <[email protected]>

Author: khoa-nguyen-18

drivers/ra/README

@@ -6,7 +6,7 @@ Origin:
    https://www.renesas.com/us/en/software-tool/flexible-software-package-fsp
 
 Status:
-   version v5.3.0
+   version v5.8.0
 
 Purpose:
    Flexible Software Package (FSP) for Renesas RA MCU Family.