kernel: Board file cleanups and additions

Removes old board file hacks that were put in place for Palmetto.
  arm: aspeed: Remove SCU8C hacks
  arm: dts: aspeed: Remove unused pinmux from Palmetto
  arm: aspeed: Remove SCU88 hacks
  arm: aspeed: Remove UART muxing hacks

Adds LPC to AHB bridge mapping and rear UART for Witherspoon
  arm: dts: aspeed: Add UARTs to Witherspoon
  arm: aspeed: witherspoon: Setup LPC to AHB bridge
  ARM: dts: aspeed: resurrect PNOR on ast2500 evb

Zaius device tree additions
  ARM: dts: aspeed: zaius: Add I2C master selector and hotswap controller
  ARM: dts: aspeed: zaius: Add 1-wire buses

Some compile warnings:
  arm: aspeed: Fix unused variable warning
  pinctrl: aspeed: Add parentheses to HW_STRAP test

Change-Id: If1473a10a0f99b3fcb9f158cb9ccaa71866f4fe1
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 46deaa2..f05cceb 100644
--- a/common/recipes-kernel/linux/linux-obmc_4.7.bb
+++ b/common/recipes-kernel/linux/linux-obmc_4.7.bb
@@ -1,5 +1,6 @@
 KBRANCH ?= "dev-4.7"
 LINUX_VERSION ?= "4.7"
-SRCREV="e62c7f11175525c028d9a6abaf6a2a5c275664d1"
+
+SRCREV="90f82cf8e49f31c2e38e7f1abf564a8f5d89f80d"
 
 require linux-obmc.inc