HAL_ChibiOS: required EXPECTED_CLOCK in all MCU files

this ensures we validate the clock setup at compile time

libraries/AP_HAL_ChibiOS/hwdef/scripts/STM32F105xC.py

@@ -23,7 +23,9 @@ pincount = {
 mcu = {
     'RAM_MAP' : [
         (0x20000000, 64, 1), # main memory, DMA safe
-    ]
+    ],
+
+    'EXPECTED_CLOCK' : 72000000
 }
 
 ADC1_map = {

libraries/AP_HAL_ChibiOS/hwdef/scripts/STM32F407xx.py

@@ -18,7 +18,9 @@ mcu = {
     'RAM_MAP' : [
         (0x20000000, 128, 1), # main memory, DMA safe
         (0x10000000,  64, 2), # CCM memory, faster, but not DMA safe
-    ]
+    ],
+
+	'EXPECTED_CLOCK' : 168000000
 }
 
 DMA_Map = {

libraries/AP_HAL_ChibiOS/hwdef/scripts/STM32F412Rx.py

@@ -17,7 +17,9 @@ mcu = {
     # flags of 2 means faster memory for CPU intensive work
     'RAM_MAP' : [
         (0x20000000, 256, 1), # main memory, DMA safe
-    ]
+    ],
+
+    'EXPECTED_CLOCK' : 100000000,
 }
 
 DMA_Map = {

libraries/AP_HAL_ChibiOS/hwdef/scripts/STM32F469xx.py

@@ -31,7 +31,9 @@ mcu = {
     'RAM_MAP' : [
         (0x20000000, 320, 1), # main memory, DMA safe
         (0x10000000,  64, 1), # CCM memory, faster, not DMA safe
-    ]
+    ],
+
+	'EXPECTED_CLOCK' : 180000000
 }
 
 DMA_Map = {

libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py

@@ -1006,7 +1006,7 @@ def write_mcu_config(f):
 #endif
 ''')
 
-    if get_mcu_config('EXPECTED_CLOCK'):
+    if get_mcu_config('EXPECTED_CLOCK', required=True):
         f.write('#define HAL_EXPECTED_SYSCLOCK %u\n' % get_mcu_config('EXPECTED_CLOCK'))
 
     env_vars['CORTEX'] = cortex