Switch userspace to use MTD access by default

Currently pflash defaults to using the MMIO interface through /dev/mem.
We want to disable /dev/mem in production systems in the near future, so
all non-debugging uses of it need to be eliminated.

The new version of pflash defaults to MTD access. It also brings some
API cleanups to libflash.

We recently moved flasher to use MTD. This updates skeleton to pull in
an update to flasher so that it can build against the new libflash API.

Fixes: openbmc/openbmc#713

Change-Id: I6bde91c7df5d0588fc48dd2e847f21f0624a6950
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/meta-phosphor/classes/skeleton-rev.bbclass b/meta-phosphor/classes/skeleton-rev.bbclass
index abc56b3..82b3f0a 100644
--- a/meta-phosphor/classes/skeleton-rev.bbclass
+++ b/meta-phosphor/classes/skeleton-rev.bbclass
@@ -1,2 +1,2 @@
-SRCREV ?= "29eaf4d4143056d271ee65f1c6126c533b87a49d"
+SRCREV ?= "ead1c62dca8f8237ad3a898ca0af4d48e3855ff2"
 SKELETON_URI ?= "git://github.com/openbmc/skeleton"