New boards with layouts for dual partition setups (#387)

* upgradable boards

* updates the install manual for proper SSL config

* storage locations from build script

* deploy script improvements

* UTC time

boards/nordic/nrf52840dk_opensk_b/layout.ld

@@ -0,0 +1,13 @@
+/* Memory Space Definitions, 1M flash, 256K ram */
+MEMORY
+{
+  rom (rx)  : ORIGIN = 0x00060000, LENGTH = 128K
+  prog (rx) : ORIGIN = 0x00080000, LENGTH = 128K
+  ram (rwx) : ORIGIN = 0x20000000, LENGTH = 256K
+}
+
+MPU_MIN_ALIGN = 8K;
+PAGE_SIZE = 4K;
+
+INCLUDE ../../kernel_layout.ld
+