src/drivers: Drop unneeded empty lines

Change-Id: I202e5d285612b9bf237b588ea3c006187623fdc3
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44609
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

src/drivers/usb/ehci.h

@@ -40,7 +40,6 @@ struct ehci_caps {
 	u8		portroute[8];	 /* nibbles for routing - offset 0xC */
 } __packed;
 
-
 /* Section 2.3 Host Controller Operational Registers */
 struct ehci_regs {