dmaengine: bcm2835: fix typo/added newline in legacy-mode warning message

Fix typo in warning message that there is no "interrupt-names"
property defined in the device-tree and legacy-mode is used.

Also added newline to end of message.

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>