extcon: Drop unexpected word "the" in the comments

there is an unexpected word "the" in the comments that need to be dropped

file: ./drivers/extcon/extcon.c
line: 250

/* Find the the index of extcon cable in edev->supported_cable */
changed to
/* Find the index of extcon cable in edev->supported_cable */

Signed-off-by: Jiang Jian <jiangjian@cdjrlc.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>