Fix crash when pin ISR handler fires (i.e. LoRa TX done) during flash operation (i.e. ota_write() call)

I was seeing crashes with "Cache disabled but cached memory region accessed" as reason.
The coredump showed one of the threads being inside spi_flash_op_block_func(), while the thread that caused the crash was an ISR (with LoRa's OnRadioTxDone handler somewhere in the stacktrace).
The comment above spi_flash_op_block_func(), suggests that interrupt handlers must be in IRAM when being accessed during a flash operation.
This change will put code/data that is accessed from ISR handlers into IRAM/DRAM to prevent the crash.

Author: martijnthe

esp32/lora/sx1272-board.c

@@ -14,6 +14,7 @@ Maintainer: Miguel Luis and Gregory Cristian
 */
 
 #include "board.h"
+#include "esp_attr.h"
 
 #if defined(LOPY) || defined (FIPY)
 
@@ -25,7 +26,7 @@ Maintainer: Miguel Luis and Gregory Cristian
 /*!
  * Radio driver structure initialization
  */
-const struct Radio_s Radio =
+DRAM_ATTR const struct Radio_s Radio =
 {
     SX1272Init,
     SX1272GetStatus,

esp32/lora/sx1276-board.c

@@ -14,6 +14,7 @@ Maintainer: Miguel Luis and Gregory Cristian
 */
 
 #include "board.h"
+#include "esp_attr.h"
 
 #if defined(LOPY4)
 
@@ -24,7 +25,7 @@ Maintainer: Miguel Luis and Gregory Cristian
 /*!
  * Radio driver structure initialization
  */
-const struct Radio_s Radio =
+DRAM_ATTR const struct Radio_s Radio =
 {
     SX1276Init,
     SX1276GetStatus,

lib/lora/mac/region/Region.c

@@ -629,7 +629,7 @@ bool RegionIsActive( LoRaMacRegion_t region )
     }
 }
 
-PhyParam_t RegionGetPhyParam( LoRaMacRegion_t region, GetPhyParams_t* getPhy )
+IRAM_ATTR PhyParam_t RegionGetPhyParam( LoRaMacRegion_t region, GetPhyParams_t* getPhy )
 {
     PhyParam_t phyParam = { 0 };
     switch( region )

lib/lora/mac/region/RegionEU868.c

@@ -184,7 +184,7 @@ static uint8_t CountNbOfEnabledChannels( bool joined, uint8_t datarate, uint16_t
     return nbEnabledChannels;
 }
 
-PhyParam_t RegionEU868GetPhyParam( GetPhyParams_t* getPhy )
+IRAM_ATTR PhyParam_t RegionEU868GetPhyParam( GetPhyParams_t* getPhy )
 {
     PhyParam_t phyParam = { 0 };