Fix pin names of uart/gpio in artys7 toplevel
Fix pin names of uart/gpio in artys7 toplevel

Signed-off-by: Olof Kindgren <31cf4bdc038d9a62332766b559358ec4a0e176e7@gmail.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan