kernel: Zaius and MTD SPI-NOR updates

Updates for Zaius from Xo:

 ARM: dts: aspeed: zaius: Update EVT2 LED GPIOs
 arm: aspeed: zaius: Disable pulldown resistors on 1-wire IOs
 ARM: dts: aspeed: zaius: Enable UART1
 arm: aspeed: zaius: Reset PHY regardless of board revision

GPIO header fix from Xo:

 gpio: dt-bindings: Fix typo in two-letter ports

SPI NOR speedups from Rob:

 mtd: spi-nor: aspeed: fix DMA access on AST2500
 mtd: spi-nor: aspeed: add support for SPI dual IO read mode
 mtd: spi-nor: add SPI_NOR_DUAL_READ to mx66l51235l

Change-Id: I545c3fd0fee13a70bbbcd189ff7385ec914c9c6c
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 f2aa16b..f970984 100644
--- a/common/recipes-kernel/linux/linux-obmc_4.7.bb
+++ b/common/recipes-kernel/linux/linux-obmc_4.7.bb
@@ -1,6 +1,6 @@
 KBRANCH ?= "dev-4.7"
 LINUX_VERSION ?= "4.7"
 
-SRCREV="120956cab11d86fa801d53811ed2f7f844216a2f"
+SRCREV="b40fcf1208470a9107caaf7e73387799f32c5111"
 
 require linux-obmc.inc