staging/greybus: eliminate use of NAME_SIZE for strings

Instead, depend on the size of the destination buffer for easier
refactoring.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20210221154258.119503-1-memxor@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>