boot: Add capability for ram loading

The MCUBOOT_RAM_LOAD feature supports configurations where code is
loaded from flash into RAM before execution.  As such, it is not
necessary for upgrades to move data around in flash.

Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/boot/bootutil/src/caps.c b/boot/bootutil/src/caps.c
index 87bac1a..be06271 100644
--- a/boot/bootutil/src/caps.c
+++ b/boot/bootutil/src/caps.c
@@ -72,6 +72,9 @@
 #if defined(MCUBOOT_AES_256)
     res |= BOOTUTIL_CAP_AES256;
 #endif
+#if defined(MCUBOOT_RAM_LOAD)
+    res |= BOOTUTIL_CAP_RAM_LOAD;
+#endif
 
     return res;
 }