Modify the generated files for example lighting and lock apps to include server init callbacks.

[bzbarsky-apple]

This allows the app to implement
emberAfPluginOnOffClusterServerPostInitCallback to sync up the data
model state with the state of the actual device when the data model
initializes.

Problem

We're not enabling the on/off server init callback, which is the right place for apps to sync up data model state with the state of the world at app startup.

Summary of Changes

Change the generated files to enable the callback.

[github-actions]

Size increase report for "nrfconnect-example-build"

File	Section	File	VM
chip-lock.elf	text	6	6
chip-lock.elf	rodata	4	4
chip-lock.elf	[LOAD #1 [RWX]]	-6	-6
chip-lighting.elf	text	6	6
chip-lighting.elf	rodata	4	4
chip-lighting.elf	[LOAD #1 [RWX]]	-6	-6

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-lock.elf and ./pull_artifact/chip-lock.elf:

sections,vmsize,filesize
.strtab,0,121
.symtab,0,96
.debug_info,0,68
.debug_str,0,35
.debug_frame,0,16
text,6,6
rodata,4,4
[Unmapped],0,3
.debug_line,0,1
[LOAD #1 [RWX]],-6,-6

Comparing ./master_artifact/chip-shell.elf and ./pull_artifact/chip-shell.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-lighting.elf and ./pull_artifact/chip-lighting.elf:

sections,vmsize,filesize
.strtab,0,121
.symtab,0,96
.debug_info,0,41
.debug_str,0,35
[Unmapped],0,6
text,6,6
rodata,4,4
.debug_line,0,1
[LOAD #1 [RWX]],-6,-6