Bluetooth: btintel_pcie: Use strscpy() instead of strscpy_pad()

kzalloc() already zero-initializes the destination buffer 'data', making
strscpy() sufficient for safely copying 'name'. The additional
NUL-padding performed by strscpy_pad() is unnecessary.

Add a new local variable to store the length of 'name' and reuse it
instead of recalculating the same length.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>