drivers: edac: Update banks for edac sysfs entry

Pass the number of banks and bank name to edac framework to have sysfs
nodes created for each llcc bank for reading out the ce/ue error counts.
Add edac device before registering for interrupt, as the interrupt
handler uses edac device for interrupt processing and would result into
crash if there is any ecc error immidiately after registering the interrupt
and before adding the edac device.

Change-Id: I2c36458684feaf68a63203f871df91f862354e6a
Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>