pia-am335x-sk: add initial support for SK baseboard

- Ethernet, MMC should work

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
pia-am335x-sk: add support for can, usb, gpios and leds

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
pia-am335x: fix possible issue with board name check

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
Merge branch 'pia335x-sk' into pia335x-dev

* pia335x-sk:
  arm: pia-am335x: fix possible issue with board name check
  arm: pia-am335x-sk: add support for can, usb, gpios and leds
  arm: pia-am335x-sk: add initial support for SK baseboard
Merge branch 'pia335x-apc' into pia335x-dev

* pia335x-apc:
  arm: pia-am335x-apc: fix pinmux for IBIS UART
  arm: pia-am335x-apc: update defaults for Battery Power GPIO
  arm: pia-am335x: remove newline from bt_en gpio name
  arm: pia-am335x-apc: switch default baseboard led trigger to mmc0
  arm: pia-am335x-apc: fix gpio3_16 signal name
  arm: pia-am335x-apc: add CAN support
  arm: pia-am335x-apc: add ethernet support
  arm: pia-am335x-apc: add USB support
  arm: pia-am335x-apc: add support for GPIO LED devices
  arm: pia-am335x: simplify MMC2 pinmux
  arm: pia-am335x-apc: add spidev support for SPI0.1
  arm: pia-am335x-apc: add base pinmux for APC board
  arm: am33xx: add missing UART5 signal to pinmux table
  arm: pia-am335x-apc: add support for BT WLAN module
  arm: pia-am335x-apc: add initial board support for APC baseboard
  arm: pia-am335x: comment & todo cleanup
  arm: pia-am335x: more generic wl12xx setup