staging/easycap: kill EASYCAP_IS_VIDEODEV_CLIENT compilation conditional

remove EASYCAP_IS_VIDEODEV_CLIENT and irrelevant code as the define
is always set in the in-kernel driver

Cc: Mike Thomas <rmthomas@sciolus.org>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --cc drivers/staging/easycap/Makefile
Simple merge

diff --cc drivers/staging/easycap/easycap.h
Simple merge

diff --cc drivers/staging/easycap/easycap_main.c
Simple merge

diff --cc drivers/staging/easycap/easycap_sound_oss.c
Simple merge