Add the support for changing bootrom

[Konste11ation]

This PR adds the support for changing bootrom address by boot_mode_i at the chip level

1. Modify the occamy_soc_ctrl.sv: Add the boot_addr signals in occamy_soc_ctrl.sv.

   // boot address
   logic [31:0] boot_addr_d, boot_addr_q;
   logic [31:0] boot_addr_init;
   logic [1:0] boot_mode;
   assign boot_mode = hw2reg_i.boot_mode.d;

always_comb begin
boot_addr_init = (boot_mode == 2'b00)? ${default_boot_addr}:${backup_boot_addr};
boot_addr_d = (boot_mode == 2'b00)? ${default_boot_addr}:${backup_boot_addr};
boot_addr_o = boot_addr_q;
end
The ${backup_boot_addr} is defined in occamy_cfg and the ${default_boot_addr} is set to the starting address of from.
2. Do some clean up on the hbm xbar
3. Do some clean up on the occamy gen flag during rtl generation
4. Do some clean up on the bender file

[IveanEx]

Good job! A small suggestion: As there is AddrWidth argument, can you also define all boot_addr_i at the same width except the one goes into quadrant? This will be beneficial for our later system!