common: console: move break; statement

In console_setfile(), there is some #ifdef'ed code, updating monitor
functions for a U-Boot proper build. This is called inside a switch/case
statement, but the closing "break;" is inside the #ifdef section.
This doesn't look right: we should not fall through to the error case
for an SPL/TPL build.

Move the "break" to be always effective, solving a compiler warning about
an untagged implicit fallthrough.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Tom Rini <trini@konsulko.com>