ARM: SAMSUNG: Implement set_name function for ADC devices

This patch implements s3c_adc_setname() for Samsung SoCs.
Also updates its usage in S3C64XX, S5P6440, and S5PV210.

Signed-off-by: Naveen Krishna Ch <ch.naveen@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>