configs: Fixup some CPSW-related items

configs: Fixup some CPSW-related items

- For am335x_pdu001 we do not want the CPSW driver, drop it
- Re-sync the defconfig for am43xx_evm_rtconly as it came in after the
  patch that converted CPSW to Kconfig was posted but before it was
  applied.
- Drop empty section / comments from pengwyn
- Drop empty section / comments from baltos and drop unused
  CONFIG_SPL_NET_VCI_STRING (it does not enable CONFIG_SPL_NET_SUPPORT
  currently and SPL_NET_VCI_STRING has been migrated already).

Cc: Felix Brack <[email protected]>
Cc: Lokesh Vutla <[email protected]>
Cc: Yegor Yefremov <[email protected]>
Cc: Lothar Felten <[email protected]>
Fixes: f02b8d17619f ("Migrate CONFIG_DRIVER_TI_CPSW to Kconfig")
Signed-off-by: Tom Rini <[email protected]>
Reviewed-by: Felix Brack <[email protected]>
Tested-by: Felix Brack <[email protected]>