mfd: stmpe: Probe sub-function by compatible

Use sub-function of_compatible during probe, instead of using the node
name. The code should not rely on the node names during probe, in
addition to that the previously hard-coded node names are not compliant
to the latest naming convention (they are not generic and they use
underscores), and it was broken by mistake already once [1].

[1] commit 56086b5e804f ("ARM: dts: imx6qdl-apalis: Avoid underscore in node name")

Suggested-by: Ahmad Fatoum <[email protected]>
Signed-off-by: Francesco Dolcini <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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