[i3c] Clean Verible lint

The `i3c` IP currently has multiple lint violations in Verible. For instance, running
```
verible-verilog-lint \
--rules_config=hw/lint/tools/veriblelint/lowrisc-styleguide.rules.verible_lint \
--waiver_files=verible_waiver hw/ip/i3c/rtl/*.sv
```
on PR #30972 gives:
```
hw/ip/i3c/rtl/i3c_consts_pkg.sv:145:31-53: Localparam name does not match the naming convention defined by regex pattern: (([A-Z0-9]+[a-z0-9]*)+(_[0-9]+)?)|([A-Z_0-9]+) [Style: constants] [parameter-name-style]
hw/ip/i3c/rtl/i3c_consts_pkg.sv:147:31-58: Localparam name does not match the naming convention defined by regex pattern: (([A-Z0-9]+[a-z0-9]*)+(_[0-9]+)?)|([A-Z_0-9]+) [Style: constants] [parameter-name-style]
hw/ip/i3c/rtl/i3c_reg_top.sv:10755:101: Line length exceeds max: 100; is: 101 [Style: line-length] [line-length]
hw/ip/i3c/rtl/i3c_reg_top.sv:10763:101-110: Line length exceeds max: 100; is: 110 [Style: line-length] [line-length]
hw/ip/i3c/rtl/i3c_reg_top.sv:10779:101: Line length exceeds max: 100; is: 101 [Style: line-length] [line-length]
hw/ip/i3c/rtl/i3c_reg_top.sv:10795:101-112: Line length exceeds max: 100; is: 112 [Style: line-length] [line-length]
hw/ip/i3c/rtl/i3c_reg_top.sv:10811:101-108: Line length exceeds max: 100; is: 108 [Style: line-length] [line-length]
hw/ip/i3c/rtl/i3c_reg_top.sv:10827:101-109: Line length exceeds max: 100; is: 109 [Style: line-length] [line-length]
hw/ip/i3c/rtl/i3c_target.sv:665:101-107: Line length exceeds max: 100; is: 107 [Style: line-length] [line-length]
```

Not urgent or critical for functionality, but needs to be cleaned up.