nrf52820_microbit: Switch USB & I2C IRQ priorities to reduce I2C issues on USB serial connection.

Author: microbit-carlos

source/hic_hal/nordic/nrf52820/nrfx/nrfx_config_nrf52820.h

@@ -1276,7 +1276,7 @@
 // <7=> 7
 
 #ifndef NRFX_TWIS_DEFAULT_CONFIG_IRQ_PRIORITY
-#define NRFX_TWIS_DEFAULT_CONFIG_IRQ_PRIORITY 2
+#define NRFX_TWIS_DEFAULT_CONFIG_IRQ_PRIORITY 1
 #endif
 
 // <e> NRFX_TWIS_CONFIG_LOG_ENABLED - Enables logging in the module.
@@ -1595,7 +1595,7 @@
 // <7=> 7
 
 #ifndef NRFX_USBD_DEFAULT_CONFIG_IRQ_PRIORITY
-#define NRFX_USBD_DEFAULT_CONFIG_IRQ_PRIORITY 1
+#define NRFX_USBD_DEFAULT_CONFIG_IRQ_PRIORITY 2
 #endif
 
 // <q> USBD_CONFIG_DMASCHEDULER_ISO_BOOST  - Give priority to isochronous transfers