backlight/gpio_backlight: Rename field 'fbdev' to 'dev'

Rename the field 'fbdev' in struct gpio_backlight_platform_data and
struct gpio_backlight to 'dev', as they store pointers to the Linux
platform device; not the fbdev device. Makes the code easier to
understand.

Signed-off-by: Thomas Zimmermann <[email protected]>
Cc: Rich Felker <[email protected]>
Cc: John Paul Adrian Glaubitz <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: Daniel Thompson <[email protected]>
Cc: Jingoo Han <[email protected]>
Cc: [email protected]
Reviewed-by: Sam Ravnborg <[email protected]>
Reviewed-by: Daniel Thompson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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