dt-bindings: clock: exynos850: Add APM_AP MAILBOX clock

Add a constant for APM-to-AP mailbox clock. This clock is needed
to access this mailbox registers.

Signed-off-by: Alexey Klimov <alexey.klimov@linaro.org>
Link: https://patch.msgid.link/20260320-exynos850-ap2apm-mailbox-v1-1-983eb3f296fc@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

Author: laklimov

include/dt-bindings/clock/exynos850.h

@@ -126,6 +126,7 @@
 #define CLK_GOUT_GPIO_ALIVE_PCLK	22
 #define CLK_GOUT_PMU_ALIVE_PCLK		23
 #define CLK_GOUT_SYSREG_APM_PCLK	24
+#define CLK_GOUT_MAILBOX_APM_AP_PCLK	25
 
 /* CMU_AUD */
 #define CLK_DOUT_AUD_AUDIF		1