vfio/platform: Fix spelling mistake "registe" -> "register"

There is a spelling mistake in a comment, fix it.
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Acked-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <20210326083528.1329-5-thunder.leizhen@huawei.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/platform/reset/vfio_platform_calxedaxgmac.c

@@ -26,7 +26,7 @@
 #define XGMAC_DMA_CONTROL       0x00000f18      /* Ctrl (Operational Mode) */
 #define XGMAC_DMA_INTR_ENA      0x00000f1c      /* Interrupt Enable */
 
-/* DMA Control registe defines */
+/* DMA Control register defines */
 #define DMA_CONTROL_ST          0x00002000      /* Start/Stop Transmission */
 #define DMA_CONTROL_SR          0x00000002      /* Start/Stop Receive */