build: convert usb.mak to Kconfig

build: convert usb.mak to Kconfig

Instead of including the same list of devices for each target,
let the host controllers select CONFIG_USB and make the devices
default to present whenever USB is available.

Done with the following script:
  while read i; do
     i=${i%=y}; i=${i#CONFIG_}
     sed -i -e'/^config '$i'$/!b' -en \
            -e'a\' -e'    default y\' -e'    depends on USB' \
          `grep -lw $i hw/*/Kconfig`
  done < default-configs/usb.mak

followed by adding "select USB" on the host controllers.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20190123065618.3520-33-yang.zhong@intel.com>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>