dm: key: Use half range mechanism for adc keys

Following the upstream adc-button.c file.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: I0b59eff483310601adfac9724fb4ac43307cafb3

input: keys: update adc range and margin

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: I7be78c5fde447e60f2a63efadf42e90eda4d8ef2

input: adc keys: update adc range for saradc v2

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: I49e37b3f22158574a2ae8397434980c4f31ac103

dm: key: refactor code

- use standard dm framework to implement all key drivers;
- all key node to be children and attach to key bus;
- dm key uclass takes over most work;
- reduce a lot of driver c

dm: key: refactor code

- use standard dm framework to implement all key drivers;
- all key node to be children and attach to key bus;
- dm key uclass takes over most work;
- reduce a lot of driver code size;

Change-Id: I9ea4515249d493eb4434890b90350f694c07404f
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>

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dm: key: optimise framework and update drivers

1. dm key framework takes over more generic jobs;
2. key drivers remove unused codes and match new framework;
3. only power key is registered as interr

dm: key: optimise framework and update drivers

1. dm key framework takes over more generic jobs;
2. key drivers remove unused codes and match new framework;
3. only power key is registered as interrupt key;

Change-Id: Icdda86f588af721b685f801ed251581f2fd85793
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>

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input: key: add adc key driver

Change-Id: I07c044942aa89309c48c79e26a86c3a61437deec
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>