Added support for reload_config

This service does not need to start so early (even
before the netwrok is up). Start it after
the device is mostly up and operational.

Compile-tested on: ipq806x
Runtime-tested on: ipq806x

Signed-off-by: Marc Benoit <marcb62185@gmail.com>

Added the ability to change sampling interval
and provide a list of IRQ's to ignore
via /etc/config/irqbalance

Signed-off-by: Marc Benoit <marcb62185@gmail.com>

Upgraded from 1.2.0 to 1.6.0 to pick up
all the latest fixes and improvements

irqbalance made glib2 mandatory since 1.3.0, but is
using very little of it. glib2 linked statically
to minimize the impact.

1.2.0 size: 33,619
1.6.0 size: 99,539

~# irqbalance --version
	irqbalance version 1.6.0

~# ldd /usr/sbin/irqbalance
	/lib/ld-musl-armhf.so.1 (0xb6f5f000)
	libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb6f43000)
	libc.so => /lib/ld-musl-armhf.so.1 (0xb6f5f000)

~# opkg info irqbalance
	Package: irqbalance
	Version: 1.6.0-6
	Depends: libc
	Status: install user installed
	Architecture: arm_cortex-a7_neon-vfpv4
	Installed-Time: 1582839249

Compile-tested: ipq806x/R7800 & ipq40xx/GL-B1300
Run-tested:     ipq806x/R7800 & ipq40xx/GL-B1300

Signed-off-by: Marc Benoit <marcb62185@gmail.com>

Add support for uci config file.

Only a global 'enabled" switch has been implemented so far.

* Default config disables irqbalance initially, so that there is
  no change with the previous behaviour (and the possibly existing
  separate launch scripts in people's builds).

Config file and init script can be later extended for irqbalance
options like the oneshot mode or the evaluation interval

(Also change the init file to use tabs)

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

Signed-off-by: Aleksandr Mezin <mezin.alexander@gmail.com>

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

Revert an upstream commit to enable compiling without external glib2.

Edit the 'disable UI compilation' patch to match the original
upstream commit more closely.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

The purpose of irqbalance is to distribute hardware interrupts across
processors/cores on a multiprocessor/-core system in order to increase
performance.

This initial implementation of the package uses external glib2,
which is a large dependency.
Only the cmd-line tool is compiled and installed.

Run-tested with ipq806x / R7800.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>