Add A1 bitstream and pentest firmware

[andrea-caforio]

This commit adds the OpenTitan Earl Grey A1 FPGA bitstream and the pentest binary to the repository. The previous binaries for the Earl Grey Z1 version are retained with the filename suffix z1.

The FPGA bitstream was generated from commit https://github.com/lowRISC/opentitan/commit/282d863 and created with the command: /bazelisk.sh build //hw/bitstream/vivado:fpga_cw310_test_rom

The pentest binary was generated from commit https://github.com/lowRISC/opentitan/commit/b2cee40 and created with the command: ./bazelisk.sh build //sw/device/tests/penetrationtests/firmware:firmware_fpga_cw310_test_rom