Add custom partition for ESP RainMaker (#4873)

It adds the fctry partition needed for ESP RainMaker.

Author: sweetymhaiske

Diff for: boards.txt

@@ -220,6 +220,9 @@ esp32.menu.PartitionScheme.fatflash.upload.maximum_size=2097152
 esp32.menu.PartitionScheme.app3M_fat9M_16MB=16M Flash (3MB APP/9MB FATFS)
 esp32.menu.PartitionScheme.app3M_fat9M_16MB.build.partitions=app3M_fat9M_16MB
 esp32.menu.PartitionScheme.app3M_fat9M_16MB.upload.maximum_size=3145728
+esp32.menu.PartitionScheme.rainmaker=RainMaker
+esp32.menu.PartitionScheme.rainmaker.build.partitions=rainmaker
+esp32.menu.PartitionScheme.rainmaker.upload.maximum_size=3145728
 
 esp32.menu.CPUFreq.240=240MHz (WiFi/BT)
 esp32.menu.CPUFreq.240.build.f_cpu=240000000L

Diff for: tools/partitions/rainmaker.csv

@@ -0,0 +1,6 @@
+# Name,   Type, SubType, Offset,  Size, Flags
+nvs,       data,  nvs,     0x9000,   0x5000,
+otadata,   data,  ota,     0xe000,   0x2000,
+ota_0,     app,   ota_0,   0x10000,  0x1E0000,
+ota_1,     app,   ota_1,   0x1F0000, 0x1E0000,
+fctry,     data,  nvs,     0x3D0000, 0x6000,