msm: camera: eeprom: Increase memory map count

For write operation while read memory memptr should not need to increase as
it leads to crash. This change removes that increase opertion. Also,
increasing map count to support more data reading for eeprom.

Change-Id: Ie71deb225c2513e7c18229d174a9a0e129fdd1f7
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>