board: ambiq: add config for systick of apollo3 and 4

This commit adds correct configuration for apollo3&4 systick

Signed-off-by: Hao Luo <[email protected]>

Author: AlessandroLuo

boards/ambiq/apollo3_evb/Kconfig.defconfig

@@ -1,11 +1,12 @@
 # SPDX-License-Identifier: Apache-2.0
 #
-# Copyright (c) 2024 Ambiq Micro Inc. <www.ambiq.com>
+# Copyright (c) 2024-2025 Ambiq Micro Inc. <www.ambiq.com>
 
 if BOARD_APOLLO3_EVB
 
 config SYS_CLOCK_HW_CYCLES_PER_SEC
 	default 32768 if AMBIQ_STIMER_TIMER
+	default 48000000 if CORTEX_M_SYSTICK
 
 config LOG_BACKEND_SWO_FREQ_HZ
 	default 1000000

boards/ambiq/apollo3p_evb/Kconfig.defconfig

@@ -1,11 +1,12 @@
 # SPDX-License-Identifier: Apache-2.0
 #
-# Copyright (c) 2024 Ambiq Micro Inc. <www.ambiq.com>
+# Copyright (c) 2024-2025 Ambiq Micro Inc. <www.ambiq.com>
 
 if BOARD_APOLLO3P_EVB
 
 config SYS_CLOCK_HW_CYCLES_PER_SEC
 	default 32768 if AMBIQ_STIMER_TIMER
+	default 48000000 if CORTEX_M_SYSTICK
 
 config LOG_BACKEND_SWO_FREQ_HZ
 	default 1000000

boards/ambiq/apollo4p_blue_kxr_evb/Kconfig.defconfig

@@ -1,11 +1,12 @@
 # SPDX-License-Identifier: Apache-2.0
 #
-# Copyright (c) 2023 Ambiq Micro Inc. <www.ambiq.com>
+# Copyright (c) 2023-2025 Ambiq Micro Inc. <www.ambiq.com>
 
 if BOARD_APOLLO4P_BLUE_KXR_EVB
 
 config SYS_CLOCK_HW_CYCLES_PER_SEC
 	default 32768 if AMBIQ_STIMER_TIMER
+	default 96000000 if CORTEX_M_SYSTICK
 
 config LOG_BACKEND_SWO_FREQ_HZ
 	default 1000000

boards/ambiq/apollo4p_evb/Kconfig.defconfig

@@ -1,11 +1,12 @@
 # SPDX-License-Identifier: Apache-2.0
 #
-# Copyright (c) 2024 Ambiq Micro Inc. <www.ambiq.com>
+# Copyright (c) 2024-2025 Ambiq Micro Inc. <www.ambiq.com>
 
 if BOARD_APOLLO4P_EVB
 
 config SYS_CLOCK_HW_CYCLES_PER_SEC
 	default 32768 if AMBIQ_STIMER_TIMER
+	default 96000000 if CORTEX_M_SYSTICK
 
 config LOG_BACKEND_SWO_FREQ_HZ
 	default 1000000