Add key layout for 8BitDo SN30 Pro gamepad

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# 8BitDo - SN30 Pro gamepad in Android (D-Input) mode

#

# Mapping according to https://developer.android.com/training/game-controllers/controller-input.html

# Button labeled as "A" but should really produce keycode "B"

key 304      BUTTON_B

# Button labeled as "B" but should really produce keycode "A"

key 305      BUTTON_A

# Button labeled as "X" but should really produce keycode "Y"

key 307      BUTTON_Y

# Button labeled as "Y" but should really produce keycode "X"

key 308      BUTTON_X

key 310      BUTTON_L1

key 312      BUTTON_L2

key 311      BUTTON_R1

key 313      BUTTON_R2

# Button "Start" does not emit event when gamepad is in Android mode

# Button "Home"

key 306      BUTTON_MODE

key 314      BUTTON_SELECT

key 315      BUTTON_START

key 317      BUTTON_THUMBL

key 318      BUTTON_THUMBR

# Left Analog Stick

axis 0x00    X

axis 0x01    Y

# Right Analog Stick

axis 0x02    Z

axis 0x05    RZ

# Dpad

axis 0x10    HAT_X

axis 0x11    HAT_Y