staging: wilc1000: rename u16FrameType of struct reg_frame

This patch renames u16FrameType of struct reg_frame to frame_type
to avoid CamelCase naming convention.

Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>