Staging: nvec: Remove macro definition to_nvec_led

Remove definition 'to_nvec_led' because it is only used once.
Rewrite the code directly in the calling function
'nvec_led_brightness_set'.

Signed-off-by: Sumitra Sharma <sumitraartsy@gmail.com>
Link: https://lore.kernel.org/r/20230322054051.GA150453@sumitra.com


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