[Telink] Add Thread Optimization Configs

- OPENTHREAD_CSMABACKOFF_OPTIMIZATION
- IEEE802154_TLX_OPTIMIZATION
- set COMMON_LIBC_MALLOC_ARENA_SIZE to
20kb if tl7218x_retention for power consumption optimization
based on d6882ec.

Author: s07641069

config/telink/chip-module/Kconfig.defaults

@@ -88,7 +88,7 @@ config HEAP_MEM_POOL_SIZE
     default 1280
 
 config COMMON_LIBC_MALLOC_ARENA_SIZE
-    default 20716 if SOC_SERIES_RISCV_TELINK_B9X_RETENTION || (SOC_RISCV_TELINK_TL321X && ZEPHYR_VERSION_3_3)
+    default 20716 if SOC_SERIES_RISCV_TELINK_B9X_RETENTION || (SOC_RISCV_TELINK_TL321X && ZEPHYR_VERSION_3_3) || (SOC_RISCV_TELINK_TL721X && SOC_SERIES_RISCV_TELINK_TLX_RETENTION)
     default 16384 if SOC_RISCV_TELINK_TL721X || (SOC_RISCV_TELINK_TL321X && !ZEPHYR_VERSION_3_3)
     default 13568 if SOC_RISCV_TELINK_W91
     default 12288
@@ -302,6 +302,19 @@ endchoice
 config CHIP_ENABLE_ICD_SUPPORT
     default y if CHIP_THREAD_DEVICE_ROLE_SLEEPY_END_DEVICE
 
+config OPENTHREAD_CSMABACKOFF_OPTIMIZATION
+    bool "Skip initial CSMA-CA backoff when sending data requests"
+    depends on CHIP_ENABLE_ICD_SUPPORT
+    default n
+    help
+      Skip the first CSMA backoff period when sending data requests over IEEE 802.15.4.
+
+config IEEE802154_TLX_OPTIMIZATION
+    bool "Optimize 802.15.4 RF performance for TLX SoCs"
+    default n
+    help
+      Improve RF performance in IEEE 802.15.4 communication on TLX SoCs.
+
 config OPENTHREAD_THREAD_STACK_SIZE
     default 2400 if PM || SOC_RISCV_TELINK_TL321X