HID: usbhid: replace strlcat with better alternatives

In preparation for the removal of the strlcat() API as per the KSPP,
replace the string concatenation logic in hid-core, usbkbd, and
usbmouse with struct seq_buf, which tracks the current write position
and remaining space internally. The changes implemented include:

- Replace device name and phys concatenation with seq_buf_puts().
- Include Struct seq_buf and its initialization.
- Include header file of seq_buf.
- Replace strlen() with seq_buf_used() on the string buffer which was
  tracked by seq_buf to increase speed.
- Add size_t len in files which did not have it.
- Use of strscpy with length in place of strlcat.

Testing: This driver was compiled as a module as well as in-built in
QEMU with the QEMU basic mouse, and QEMU basic keyboard. The testing was
done in the following steps.
- Add Hardware Mouse in QEMU checking the usbhid module.
- Verify dmesg string name of mouse.
- Blacklist hidusb module from auto-loading, and removing the module via
  rmmod.
- Load usbmouse module, and reattach QEMU mouse.
- Verify dmesg string name of mouse.
- Repeat same procedure on usbkbd module.

This aligns the driver with KSPP security guidelines.

Link: https://github.com/KSPP/linux/issues/370

Signed-off-by: Mahad Ibrahim <mahad.ibrahim.dev@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

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