dt-bindings: mfd: samsung,s2mps11: Add compatible for s2mpu05-pmic

dt-bindings: mfd: samsung,s2mps11: Add compatible for s2mpu05-pmic

S2MPU05 is a PMIC present in Samsung's Exynos7870 devices. It houses
voltage regulators (21 LDOs and 5 BUCKs), and an RTC module. Add the
compatible string "samsung,s2mpu05-pmic" to the PMIC documentation.

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250204-exynos7870-pmic-regulators-v1-2-05adad38102c@disroot.org
Signed-off-by: Lee Jones <lee@kernel.org>