linux-rockchip-rk3588-6.11.config: enable CONFIG_INPUT_PWM_BEEPER=m

- mostly for the cm3588 nas; mainline kernel has a `compatible = "pwm-beeper";` buzzer impl on pwm8
  - see https://github.com/torvalds/linux/blob/3d5f968a177d468cd13568ef901c5be84d83d32b/arch/arm64/boot/dts/rockchip/rk3588-friendlyelec-cm3588-nas.dts#L63-L68

config/kernel/linux-rockchip-rk3588-6.11.config

@@ -4237,7 +4237,7 @@ CONFIG_INPUT_ATI_REMOTE2=m
 # CONFIG_INPUT_REGULATOR_HAPTIC is not set
 CONFIG_INPUT_UINPUT=m
 # CONFIG_INPUT_PCF8574 is not set
-# CONFIG_INPUT_PWM_BEEPER is not set
+CONFIG_INPUT_PWM_BEEPER=m
 # CONFIG_INPUT_PWM_VIBRA is not set
 CONFIG_INPUT_RK805_PWRKEY=m
 # CONFIG_INPUT_GPIO_ROTARY_ENCODER is not set