kernel: configs; add distro.config

Inherit distro.config from 4.9 release branch, the following commits have been
squashed:

f4feb382 kernel: configs: distro.config: Build media as modules
26d98682 distro.config: enable USB device class drivers
9dc089f6 configs: distro.config: enable ZRAM
8f397674 config: enable new trigger modes for leds
45ef9272 kernel: configs: distro.config: add legacy instruction support for arm64
3cfc9326 kernel: configs: add more Bluetooth and WLAN options
2757af8e kernel: configs: distro.config: add NETFILTER_XT_MATCH_HASHLIMIT
d4396e66 distro.config: enable USB_LAN78XX
c5c7d5af distro.config: extend connectivity options
2bcb6580 kernel: configs: enable Docker support in distro.config
f90d65ad configs: move DEBUG configs in their own config file
69e32eea configs: add SPI_SPIDEV as module in distro.config
dba8b2c4 kernel: configs: add CONFIG_INPUT_JOYDEV in distro.config
98ab2d98 kernel: configs: add I2C_CHARDEV in distro.config
17a895de kernel: add DRM_LOAD_EDID_FIRMWARE in distro.config
84408f7d kernel: configs: Enable input misc device drivers
139a0dbd kernel: configs: update distro config from release branch
a390f24b kernel: configs: improve distro.config, mostly for systemd
66623888 kernel: configs: update distro.config
3e2ff9ab kernel: configs: move linaro distro.conf as proper %.config fragment

Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>