hw/usb/ehci: Rename NB_PORTS -> EHCI_PORTS

Rename NB_PORTS as EHCI_PORTS to avoid definition clash
with UHCI equivalent:

  hw/usb/hcd-ehci.h:40:9: error: 'NB_PORTS' macro redefined [-Werror,-Wmacro-redefined]
  #define NB_PORTS         6        /* Max. Number of downstream ports */
          ^
  hw/usb/hcd-uhci.h:38:9: note: previous definition is here
  #define NB_PORTS 2
          ^

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
4 files changed