[NXP K32W] Save RAM by reducing event queue length

Issue #9261

- K32W platform ran out of BSS last week
- Current usage is default max 100 events in queue. PR #17959 already reduced
  the size of each event and saved approx 600 bytes. This PR should reduce it
  further.

- This PR moves max queue size from 100 to 75, which is 25% reduction
  and much larger than some platforms which use 25 (which seems low to me)

- Other Thread platforms like QPG and EFR32 run on 25, so not worried here

Testing done:
- Sanity check on K32W via @doru91

src/platform/nxp/k32w/k32w0/CHIPDevicePlatformConfig.h

@@ -73,6 +73,9 @@
 #define CHIP_DEVICE_CONFIG_THREAD_TASK_STACK_SIZE 3072
 #endif // CHIP_DEVICE_CONFIG_THREAD_TASK_STACK_SIZE
 
+// Max size of event queue
+#define CHIP_DEVICE_CONFIG_MAX_EVENT_QUEUE_SIZE 75
+
 #ifndef CHIP_DEVICE_CONFIG_BLE_APP_TASK_NAME
 #define CHIP_DEVICE_CONFIG_BLE_APP_TASK_NAME "BLE App Task"
 #endif // CHIP_DEVICE_CONFIG_BLE_APP_TASK_NAME