msm_eeprom: change ioctl config name

Previously, EEPROM_READ_DATA and EEPROM_GET_DATA is used to read only
calibration data.  These names are too generic.  Soon we will read many
different types of data, and even a true read data API for reading
arbitrary range of data.  This name change is needed so that our enum
does not confuse userspace.

Change-Id: Ic16b322bcdea2d4c5f267efc086602ae86911281
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>