serial: bcm6858: remove driver and switch to bcm6345

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
diff --git a/configs/bcm968580_ram_defconfig b/configs/bcm968580_ram_defconfig
index abe90ee..4e10175 100644
--- a/configs/bcm968580_ram_defconfig
+++ b/configs/bcm968580_ram_defconfig
@@ -30,7 +30,7 @@
 CONFIG_CONS_INDEX=0
 CONFIG_DM_SERIAL=y
 CONFIG_SERIAL_SEARCH_ALL=y
-CONFIG_BCM6858_SERIAL=y
+CONFIG_BCM6345_SERIAL=y
 CONFIG_SYSRESET=y
 CONFIG_REGEX=y
 # CONFIG_GENERATE_SMBIOS_TABLE is not set