msm: camera: sensor: Validate eeprom_name string length

Validate eeprom_name string length before copying into
the userspace buffer.
If more data than required is copied, userspace has the access to
some of kernel data which is not intended.

This change will fix the issue.

CRs-Fixed: 1090007
Signed-off-by: Rajesh Bondugula <rajeshb@codeaurora.org>
Change-Id: Id40a287e0b1a93cc15d9b02c757fe9f347e285f2