HAL_ChibiOS: save some memory in f103-periph build

libraries/AP_HAL_ChibiOS/hwdef/f103-periph/hwdef.dat

@@ -87,10 +87,10 @@ define DMA_RESERVE_SIZE 0
 define PERIPH_FW TRUE
 
 # MAIN_STACK is stack of initial thread
-MAIN_STACK 0x100
+MAIN_STACK 0x80
 
 # PROCESS_STACK controls stack for main thread
-PROCESS_STACK 0x600
+PROCESS_STACK 0x500
 define HAL_DISABLE_LOOP_DELAY
 
 # enable CAN support
@@ -111,7 +111,8 @@ define HAL_UART_MIN_TX_SIZE 256
 define HAL_UART_MIN_RX_SIZE 128
 
 define HAL_UART_STACK_SIZE 256
-define STORAGE_THD_WA_SIZE 512
+define STORAGE_THD_WA_SIZE 256
+define IO_THD_WA_SIZE      256
 
 define HAL_NO_GCS
 define HAL_NO_LOGGING
@@ -128,7 +129,7 @@ COMPASS RM3100 SPI:rm3100 false ROTATION_NONE
 
 define HAL_I2C_CLEAR_ON_TIMEOUT 0
 
-define HAL_DEVICE_THREAD_STACK 768
+define HAL_DEVICE_THREAD_STACK 256
 
 define AP_PARAM_MAX_EMBEDDED_PARAM 0
 
@@ -145,3 +146,5 @@ env APP_DESCRIPTOR MissionPlanner
 
 # reserve 256 bytes for comms between app and bootloader
 RAM_RESERVE_START 256
+
+# define CH_DBG_ENABLE_STACK_CHECK TRUE