Cleanup FpgaConfig::write_cram_pbm tile_type initialization
Cleanup FpgaConfig::write_cram_pbm tile_type initialization

Signed-off-by: Claire Wolf <da7dd17269675e6648b2de3690262d0e18b89cca@symbioticeda.com>

SymbiFlow/icestorm,SymbiFlow/icestorm,SymbiFlow/icestorm,SymbiFlow/icestorm