The C++ files in the avr backend are a mix of TABS and
8 spaces for indentation.  This patch rectifies that
according to the coding rules.

I applied this prior to the advent of the v14 branch so
that back-porting will be easier, at least from the new master
to v14.

Johann

--

gcc/
             * config/avr/avr-log.cc: Tabify.
             * config/avr/avr-devices.cc: Tabify.
             * config/avr/avr-c.cc: Tabify.
             * config/avr/driver-avr.cc: Tabify.
             * config/avr/gen-avr-mmcu-texi.cc: Tabify.
             * config/avr/gen-avr-mmcu-specs.cc: Tabify.