Merge pull request arduino#49 from Polldo/master

Update portenta variant on mbed-os-6.2.0-40-g274a101dea

Author: facchinm

variants/PORTENTA_H7_M7/defines.txt

@@ -1,5 +1,6 @@
 
 -DARM_MATH_CM7
+-DBT_UART_NO_3M_SUPPORT
 -D__CMSIS_RTOS
 -DCOMPONENT_4343W=1
 -DCOMPONENT_CYW43XXX=1
@@ -43,7 +44,7 @@
 -DFEATURE_LWIP=1
 -D__FPU_PRESENT=1
 -D__MBED__=1
--DMBED_BUILD_TIMESTAMP=1598515239.1038344
+-DMBED_BUILD_TIMESTAMP=1599214433.25
 -D__MBED_CMSIS_RTOS_CM
 -DMBED_HEAP_STATS_ENABLED=1
 -DMBED_MEM_TRACING_ENABLED=1