[vendor] Catch keyboard interrupt for nicer error message
[vendor] Catch keyboard interrupt for nicer error message

Avoid printing a stack trace in a user-initiated abort, but print a
"nice" message instead.

Signed-off-by: Philipp Wagner <5a4b10454c30419e54a1570be358a516ff84bb63@lowrisc.org>

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