firmware: samsung: acpm: remove compile-testing stubs

Sashiko reported an inconsistent use of NULL vs ERR_PTR()
returns in the stub helpers in xynos-acpm-protocol.h.

Since this only happens on dead code for COMPILE_TEST=y, this is not
really a bug though.  Having stub functions that return NULL is a common
way to define optional interfaces, where callers still work when the
feature is disabled, though this clearly does not work for acpm because
some callers have a NULL pointer dereference when compile testing.

Since CONFIG_EXYNOS_ACPM_PROTOCOL already supports compile-testing itself,
and all (both) drivers using it clearly require the support, so this
just simplifies the option space without losing any build coverage.

Remove the stub functions entirely and adjust the one Kconfig
dependency to require EXYNOS_ACPM_PROTOCOL unconditionally.

Fixes: 6837c006d4e7 ("firmware: exynos-acpm: add empty method to allow compile test")
Closes: https://sashiko.dev/#/patchset/20260420-acpm-tmu-v3-0-3dc8e93f0b26%40linaro.org
Link: https://lore.kernel.org/all/a7994860-24a3-4f87-84bf-109ed653dda4@linaro.org/
Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20260529134454.2147446-1-arnd@kernel.org
[krzk: Rebase on difference in devm_acpm_get_by_node()]
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

0 files changed, 0 insertions, 0 deletions