revert rom_sbs.pl to version used in PDK_3.0.h as latest does not work in platform build
EXPORTS
_Z17VariantInitialisev @ 1 NONAME
_ZN7Variant10PowerResetEv @ 2 NONAME
_ZN7Variant14BaseLinAddressEv @ 3 NONAME
_ZN7Variant16MarkDebugPortOffEv @ 4 NONAME
_ZN7Variant8SwitchesEv @ 5 NONAME
_ZN7Variant8UartInitEv @ 6 NONAME