staging: rtl8712: Fix spelling mistake in rtl871x_io.h

This patch corrects misspelled word to increase code readability and
searching.

Signed-off-by: Roshan Khatri <[e-mail]>
Reviewed-by: Philipp Hortmann <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/rtl8712/rtl871x_io.h

···
 #define IO_WR_BURST(x)		(IO_WRITE_ | _IO_SYNC_ | _IO_BURST_ | \
 				((x) & _IOSZ_MASK_))
 #define IO_RD_BURST(x)		(_IO_SYNC_ | _IO_BURST_ | ((x) & _IOSZ_MASK_))
-/*below is for the intf_option bit defition...*/
+/*below is for the intf_option bit definition...*/
 #define _INTF_ASYNC_	BIT(0)	/*support async io*/
 struct intf_priv;
 struct	intf_hdl;