power: qpnp-smbcharger: Access dcin limit array properly

The loop starts with the iterator pointing to the ARRAY_SIZE of the
DCIN input limit array. The last valid accessible element should be
ARRAY_SIZE - 1.

Fix this.

Change-Id: If1f2c2db3142e4193477428348bc3cc987d84f23
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>