USB: EHCI: Remove SPARC_LEON {read,write}_be definitions from ehci.h

{read,write}l_be are now defined for SPARC and do not need to be
defined for SPARC_LEON in ehci.h. This patch fixes the following
warnings:

  CC      drivers/usb/host/ehci-hcd.o
In file included from drivers/usb/host/ehci-hcd.c:119:
drivers/usb/host/ehci.h:631:1: warning: "readl_be" redefined
...
drivers/usb/host/ehci-hcd.c:119:
drivers/usb/host/ehci.h:632:1: warning: "writel_be" redefined
...

Signed-off-by: Jan Andersson <jan@gaisler.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>