ARM: SAMSUNG: Initialize PWM backlight enable_gpio field

The GPIO API defines 0 as being a valid GPIO number, so this field needs
to be initialized explicitly.

Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --cc arch/arm/mach-s3c24xx/mach-h1940.c
Simple merge

diff --cc arch/arm/mach-s3c24xx/mach-rx1950.c
Simple merge

diff --cc arch/arm/mach-s3c64xx/mach-crag6410.c
Simple merge

diff --cc arch/arm/mach-s3c64xx/mach-hmt.c
Simple merge

diff --cc arch/arm/mach-s3c64xx/mach-smartq.c
Simple merge

diff --cc arch/arm/mach-s3c64xx/mach-smdk6410.c
Simple merge

diff --cc arch/arm/mach-s5p64x0/mach-smdk6440.c
Simple merge

diff --cc arch/arm/mach-s5p64x0/mach-smdk6450.c
Simple merge

diff --cc arch/arm/mach-s5pc100/mach-smdkc100.c
Simple merge

diff --cc arch/arm/mach-s5pv210/mach-smdkv210.c
Simple merge

diff --cc arch/arm/plat-samsung/dev-backlight.c
Simple merge