serial: sc16is7xx: fix copy-paste errors in EFR_SWFLOWx_BIT constants

serial: sc16is7xx: fix copy-paste errors in EFR_SWFLOWx_BIT constants

Comments attached to bits 0 and 1 incorrectly referenced bits 2 and 3,
which don't match the datasheet - fix them.
At the same time remove comments for individual constants, as they add
nothing to the definitions themselves.

Signed-off-by: Lech Perczak <lech.perczak@camlingroup.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/2986a485-935d-4ab2-9a16-4a85288aa15a@camlingroup.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>