verible-verilog-format: apply it on core directory

Created by: ASintzoff

using verible-v0.0-3422-g520ca4b9/bin/verible-verilog-format with default configuration

Note: two files are not correctly handled by verible

• core/include/std_cache_pkg.sv
• core/cache_subsystem/cva6_hpdcache_if_adapter.sv

Signed-off-by: André Sintzoff andre.sintzoff@thalesgroup.com