kernel: spi-nor fixes and witherspoon dts update

Fixes to bring our spi-nor mtd driver in line with Cédric's v2 upstream patch.

Cédric Le Goater (8):
  mtd: spi-nor: aspeed: fix setting of the register control value for
    writes
  mtd: spi-nor: aspeed: improve 4 bytes mode
  mtd: spi-nor: aspeed: extend the bits definitions
  mtd: spi-nor: aspeed: add some logging
  mtd: spi-nor: aspeed: use smc_read mode when doing DMAs
  mtd: spi-nor: aspeed: prepare for fast read
  mtd: spi-nor: aspeed: rework io routines
  clk: add a ahb clock for aspeed g4

Lei YU (1):
  ARM: dts: aspeed: witherspoon: Add bmp180 sensor

Change-Id: I9094477387ba46d4812ac25baf6e13a07bc4dac2
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/common/recipes-kernel/linux/linux-obmc_4.7.bb b/common/recipes-kernel/linux/linux-obmc_4.7.bb
index af4bddc..e9741b3 100644
--- a/common/recipes-kernel/linux/linux-obmc_4.7.bb
+++ b/common/recipes-kernel/linux/linux-obmc_4.7.bb
@@ -1,5 +1,5 @@
 KBRANCH ?= "dev-4.7"
 LINUX_VERSION ?= "4.7"
-SRCREV="8c7da38063c14868eab25e9d3273b6e6c304f4be"
+SRCREV="731a90c2a97d8909c27cf0ce6b52b03c0068274b"
 
 require linux-obmc.inc